Legumes · Legume
Pinto Beans
Phaseolus vulgaris · also called Pinto, frijoles pintos (Spanish)
Pinto beans are speckled pink-and-brown beans, sold dried or canned and often mashed as refried beans. They give fibre, plant protein and folate. One small trial found they lowered LDL cholesterol, and pooled trials of beans and other pulses show a small fall too. The main cautions are to cook dried beans fully (raw or undercooked beans can cause severe vomiting), gas in some people, and potassium if you have kidney disease.
General information, not medical advice. Last substantive update · Not medically reviewed. A named clinician has not signed off on this page. How this page is made
About Pinto Beans
Pinto beans are a nutritious, fibre-rich food with plant protein and folate. They are a healthy food, not a proven remedy: most health findings come from studies of beans, pulses or legumes in general, and the one pinto bean trial was very small. Cook dried beans fully.
What it is
Pinto beans are the seeds of the common bean plant (Phaseolus vulgaris), a member of the legume family. They are sold dried or canned and used whole or mashed as refried beans. The coat is speckled pink and brown. The existing site text says it fades to a uniform pink when cooked; we did not check that against a source.
USDA data for pinto beans boiled without salt: 143 kcal per 100 g. One cup (171 g) has about 245 kcal, 15.4 g protein, 15.4 g fibre, 294 micrograms folate (DFE), 746 mg potassium and 3.57 mg iron. Canned and refried beans usually have added salt or fat and were not read.
What the research shows
The firmest facts are about nutrients: beans are a fibre and folate food, and MedlinePlus says soluble fibre helps lower cholesterol. These are not trials of pinto beans.
One small randomised trial of pinto beans (16 adults, 8 weeks) found a fall in total and LDL cholesterol. Pooled trials of beans and other pulses found LDL 0.14 to 0.17 mmol/L lower, a very small weight loss (about 0.34 kg) and mixed blood sugar results. Pooled trials found no clear change in blood pressure, while cohort studies link more legumes to lower risk of high blood pressure (RR 0.84), a little less cardiovascular disease and lower death from any cause (HR 0.94). Cohort studies cannot prove cause.
Pinto beans were not tested on their own for any of these except cholesterol, blood sugar markers and gas.
Food versus extracts and supplements
The cholesterol, weight and blood pressure results come from trials of whole beans and pulses eaten as food. Bean extracts, flours and supplements are different products. We did not read trials of them and make no claim about them.
Soaking, cooking and canning
A 2026 review says legumes contain phytic acid, tannins, lectins and trypsin inhibitors that can hinder mineral absorption, and that soaking, germination, fermentation and heat reduce them. Soaking raised soluble fibre by up to 33% but some minerals leached into the water. The review is about legumes in general; no pinto-specific result was read.
Amounts
This page gives no amounts to eat. Ask a doctor, pharmacist or dietitian what is right for you, especially if you have kidney problems, take medicine for blood sugar or blood pressure, or have a food allergy.
At a glance
Traditional uses history, not proof
- Eaten as a food, dried and cooked, canned, or mashed as refried beans
- Long use as food is not proof that it treats any condition
Studied for research
- Cholesterol, low certainty for pinto beans (one small trial) and moderate for beans and pulses as a group
- Fibre, plant protein and folate, high certainty for the nutrients
- Blood sugar markers, mixed (pulses as a group)
- Blood sugar after a meal, low certainty (single-meal studies of pulses)
- Body weight, low certainty (very small effect, pulses as a group)
- Blood pressure, mixed (trials show no clear change, cohorts show a link)
- Heart disease and early death, low certainty (observational)
Main compounds
- Fibre
- Plant protein
- Folate (vitamin B9)
- Resistant starch and oligosaccharides
- Lectin PHA (in raw beans)
- Phytic acid
Common forms
- Dried pinto beans, soaked and boiled as food
- Canned pinto beans (already cooked; usually salted)
- Refried pinto beans (a prepared food with added salt or fat; values differ)
- Bean extracts, flours and supplements are different products and are not covered
Research links: 2007 trial: pinto beans and cholesterol · 2026 review: whole pulses and cholesterol · FDA: natural toxins in food (raw beans) · Research Library · Genes & Biomarkers Library
What it is and its history
- Accepted scientific name
- Phaseolus vulgaris
- Naming authority
- L. (GBIF accepted species)
- Common names
- Pinto beans (English); Common bean (the species) (English); Frijoles pintos (Spanish)
- Family or group
- Fabaceae (the legume or pea family), as given by GBIF and by the existing nutrient summary.
- Classification
- Plantae > Tracheophyta > Magnoliopsida > Fabales > Fabaceae > Phaseolus > Phaseolus vulgaris
- Native range
- Not verified from a source read.
- Habitat
- Not verified from a source read.
- What it looks like
- Roots: Not verified.; Stems: Not verified.; Leaves: Not verified.; Flowers: Not verified.; Fruit: The existing site text describes pinto beans as speckled pink-and-brown seeds whose coat fades to a uniform pink when cooked. This description was not checked against a source read.
- Cultivation
- Not verified from a source read.
- Harvest and processing
- Sold dried or canned and used whole or mashed (refried), per the existing site text, not independently verified. A 2026 review (p42494153) describes soaking, germination, fermentation and heat as processing methods for legumes.
- Look-alikes and adulterants
- Name: Red kidney beans; Note: Same species, Phaseolus vulgaris (the case report and outbreak papers name red kidney beans as P. vulgaris). Their lectin PHA is the one with documented poisonings; pinto beans were not measured.; Name: Other common bean types (black beans, navy beans); Note: Other types of the same species are listed on the site; their nutrition differs and was not read for this page.
Photographs
What is inside, and how it may work
What it contains and how those compounds act in cells and animals. Laboratory and animal mechanisms are not proven effects in people.
Main compounds
| Compound | Family | Where it is concentrated | Activity studied | Level of evidence |
|---|---|---|---|---|
| Dietary fibre | fibre | Seed USDA: 9 g per 100 g boiled; 15.5 g per 100 g dry | MedlinePlus lists beans as a soluble fibre food; soluble fibre helps lower cholesterol, insoluble fibre adds stool bulk. 27 26 20 | Human data |
| Protein | protein | Seed USDA: 9.01 g per 100 g boiled; 21.42 g per 100 g dry | A plant protein source; no pinto-specific trial of its effect was read. 27 26 | Composition data |
| Folate (vitamin B9) PubChem 135398658 | vitamin | Seed USDA: 172 micrograms DFE per 100 g boiled; 525 dry | B vitamin; dried beans and peas are natural sources (MedlinePlus). 27 21 24 | Human data |
| Resistant starch and oligosaccharides | carbohydrate | Seed Not given by USDA or Harvard for pinto beans | Gut bacteria ferment them, which feeds helpful bacteria and makes gas in some people (Harvard Nutrition Source, secondary source). 18 14 | Review |
| Phytohaemagglutinin (PHA) | lectin (protein) | Seed Not found for pinto beans. Dark red kidney beans: about 223 mg/g dry weight (ELISA); canned beans >99% lower | A lectin in raw or undercooked beans that causes nausea, vomiting and diarrhoea; destroyed by soaking and boiling. 16 10 12 | Human data |
| Phytic acid (phytate) PubChem 890 | organic acid | Seed Not found for pinto beans | Named with tannins and lectins as an antinutrient that can hinder mineral absorption; processing lowers it (2026 review). 4 25 | Review |
| Potassium and phosphorus | mineral | Seed USDA boiled: potassium 436 mg and phosphorus 147 mg per 100 g | Relevant for people with kidney disease who limit these minerals (MedlinePlus). 27 23 | Human data |
Mechanisms, receptors and pathways
| Target or pathway | Gene or receptor | What was found | Level |
|---|---|---|---|
| Fibre and cholesterol | Not specified | MedlinePlus says soluble fibre lowers cholesterol and lists beans as a soluble fibre food. The pinto trial and the pulse reviews found small LDL falls but do not prove that fibre is the cause. 20 13 2 1 | Human data |
| Fermentation in the colon and gas | Not specified | Bacteria in the colon ferment resistant starch and oligosaccharides and release gas, which can cause bloating and cramps in some people. Feeding studies found under half of people noticed more flatulence with pinto beans in week one. 18 14 | Human data |
| Lectin PHA and the gut | Carbohydrate-binding lectin (FDA description) | The FDA says lectins are proteins that bind to carbohydrates; PHA in raw or undercooked beans causes nausea, severe vomiting and diarrhoea, and soaking plus boiling destroys it. 16 12 | Human data |
| Antinutrients and mineral absorption | Not specified | Phytic acid, tannins and lectins can hinder mineral absorption; processing lowers them. No health effect in a mixed diet is shown. 4 | Review |
Absorption, metabolism and elimination
- Absorption
- Not found for pinto beans.
- Distribution
- Not found.
- Metabolism
- Not found.
- Elimination
- Not found.
- Bioavailability
- A 2026 review says antinutrients in legumes can hinder mineral absorption; no pinto-specific absorption study was read.
Isolated compounds versus whole extracts
All the cholesterol, weight and blood pressure results are for whole beans or pulses eaten as food. Bean extracts, bean flours, white kidney bean extract supplements and protein powders are different products, were not read, and are not covered. Canned and refried pinto beans are prepared foods whose salt and fat differ from the USDA boiled-without-salt values.
Nutritional composition
Nutrition from USDA FoodData Central (Beans, pinto, mature seeds, cooked, boiled, without salt, FDC 175200, SR Legacy, April 2018 release; values read 2026-10-26 from the saved copy of the USDA data feed held with the project, because the live USDA API was rate-limited that day). Per 100 g cooked: 143 kcal, 9.01 g protein, 0.65 g fat (0.136 g saturated), 26.22 g carbohydrate, 9 g fibre, 0.34 g sugars, about 63 g water, 46 mg calcium, 2.09 mg iron, 50 mg magnesium, 147 mg phosphorus, 436 mg potassium, 1 mg sodium, 0.98 mg zinc, 172 micrograms folate (DFE), 0.453 mg manganese, 0.219 mg copper, 0.193 mg thiamin, 0.229 mg vitamin B6, 3.5 micrograms vitamin K, 6.2 micrograms selenium. One cup of cooked beans (171 g): about 245 kcal, 15.4 g protein, 15.4 g fibre, 294 micrograms folate (DFE), 746 mg potassium, 251 mg phosphorus, 3.57 mg iron and 1.71 mg sodium. Dry, uncooked pinto beans (FDC 175199) per 100 g: 347 kcal, 21.42 g protein, 15.5 g fibre, 525 micrograms folate and 1,393 mg potassium; do not compare dry values with cooked values because cooking adds water. Canned and refried beans usually contain added salt or fat and were not read. Figures vary with variety, growing place and cooking time.
1 high certainty1 moderate certainty3 mixed findings4 low certainty
What was looked at
The 9 benefits and uses checked for Pinto Beans, each with how strong the evidence is. Tap one to open it.
- Cholesterol (pinto beans, one small trial)Low certainty
- Cholesterol (beans and other pulses as a group)Moderate certainty
- Blood sugar markers (pulses as a group)Mixed findings
- Fibre, plant protein and folateHigh certainty
- Blood sugar after a meal (pulses versus other starches)Low certainty
- Hunger and fullness after a meal (pulses)Mixed findings
- Body weight (pulses as a group)Low certainty
- Blood pressure (legumes as a group)Mixed findings
- Heart disease and early death (legumes, observational)Low certainty
Lab markers tracked in the studies
LDL cholesterolTotal cholesterolFasting blood glucoseBody weightSystolic blood pressureBlood glucose after a meal
What is Pinto Beans good for?
The main studied uses and how strong the human evidence is for each. Only the first cholesterol row is about pinto beans themselves; the rest are for beans, pulses or legumes as a group.
Benefits, one by one
Each card is a research question, not a promise. Tap a goal to filter. Open a card to see the studies, doses and limits.
Cholesterol (pinto beans, one small trial)
Low certaintyIn one small trial of 16 adults, eating half a cup of pinto beans a day for 8 weeks lowered total cholesterol by 19 mg/dL and LDL ("bad") cholesterol by 14 mg/dL. Black-eyed peas and a carrot placebo did not. It is the only pinto-specific trial we read, so treat it as a promising hint, not proof.
2 studiesCooked pinto beans as food, half a cup a day in the trial (trial deta…
Studies, doses and limits
What the trials found
A randomised crossover trial in 16 free-living adults with mild insulin resistance gave each person half a cup a day of pinto beans, black-eyed peas or canned carrots (placebo) for 8 weeks, with 2-week breaks. Total cholesterol changed by -19 mg/dL with pinto beans, +2.5 with black-eyed peas and +1 with carrots. LDL changed by -14, +4 and +1 mg/dL. HDL, triglycerides, hs-CRP, insulin, glucose and HbA1c did not differ significantly.
Results
Pinto beans lowered total and LDL cholesterol compared with carrots and black-eyed peas in this small trial. No difference was seen in blood sugar markers.
Effect sizes as reported
Total cholesterol -19 +/- 5 mg/dL; LDL -14 +/- 4 mg/dL (pinto) versus +1 +/- 4 (placebo).
Why this rating
One very small trial (16 people) with no repeat. The abstract does not describe blinding or who paid. Cholesterol is a marker, not a count of heart attacks.
Form and dose studied
Cooked pinto beans as food, half a cup a day in the trial (trial detail, not advice).
Who was studied
Adults with mild insulin resistance.
Limits
One trial, 8 weeks, 16 people. Not a trial of heart attacks or strokes.
Why researchers looked
Pinto beans are a common, fibre-rich food, so researchers tested whether eating them changes blood fats.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Authoritative guidance
Not tested in the trial. Soluble fibre is said by MedlinePlus to lower cholesterol, but the trial did not show that fibre was the cause.
A proposed mechanism does not show that the effect happens in people.
No safety signal in the abstract for cholesterol; gas and raw-bean cautions are on the Safety tab.
Cholesterol (beans and other pulses as a group)
Moderate certaintyPooled trials of pulses (beans, chickpeas, lentils and dried peas) found a small drop in LDL cholesterol, about 0.14 to 0.17 mmol/L. The newest review rates the certainty moderate-to-high for pulses as a group. Pinto beans were not separated out.
2 studiesWhole pulses as food (trial detail: median 130 g a day, not advice).
Studies, doses and limits
What the trials found
A 2014 meta-analysis of 26 trials (1,037 adults) found diets emphasising pulses, at a median of 130 g a day, lowered LDL by 0.17 mmol/L (95% CI -0.25 to -0.09) with no effect on apoB or non-HDL cholesterol. A 2026 update of 38 trials (2,095 adults, median 6 weeks) found LDL -0.14 mmol/L (-0.19 to -0.08), non-HDL -0.22, apoB -0.08 g/L and a very small fall in HDL cholesterol (-0.03), with similar results across pulse types. For beans the fall rose in a straight line with amount up to 1 cup a day.
Results
Eating pulses as part of the diet lowered LDL cholesterol a little in short trials. The authors call for more studies of chickpeas, dried peas and lentils.
Effect sizes as reported
LDL -0.17 mmol/L (2014, 26 trials); LDL -0.14, non-HDL -0.22, apoB -0.08, HDL -0.03 (2026, 38 trials).
Why this rating
The 2026 review rates GRADE certainty moderate-to-high (apoB very low) for whole pulses as a group. We rate it moderate for beans because the trials were short (median 6 weeks), LDL is a marker, and pinto beans were not tested separately beyond one small trial. One author of the 2026 review lists an industry-linked body (Protein Industries Canada).
Form and dose studied
Whole pulses as food (trial detail: median 130 g a day, not advice).
Who was studied
Adults in randomised trials.
Limits
Short trials; a marker rather than heart attacks; mixed pulse types.
Why researchers looked
Beans and other pulses are high in fibre and plant protein, so researchers test whether adding them to the diet changes blood fats.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Authoritative guidance
Not established in the abstracts read. MedlinePlus says soluble fibre lowers cholesterol, and beans are listed among soluble fibre foods.
A proposed mechanism does not show that the effect happens in people.
None specific for cholesterol; see the Safety tab for gas, raw beans and potassium.
Blood sugar markers (pulses as a group)
Mixed findingsPooled trials of pulses found lower fasting glucose and lower longer-term markers (HbA1c or fructosamine) when pulses were part of low-GI or high-fibre diets. Trials differed a lot. The one pinto bean trial found no change in glucose, insulin or HbA1c.
2 studiesWhole pulses as food, varied amounts.
Studies, doses and limits
What the trials found
A 2009 meta-analysis of 41 trials of at least 7 days found pulses alone (11 trials) lowered fasting glucose (SMD -0.82, 95% CI -1.36 to -0.27) and insulin (-0.49). Pulses in low-GI diets (19 trials) lowered HbA1c or fructosamine (-0.28, -0.42 to -0.14), and pulses in high-fibre diets (11 trials) lowered fasting glucose (-0.32) and HbA1c or fructosamine (-0.27). Differences between trials were high and mostly unexplained. In the pinto bean trial, glucose, insulin and HbA1c did not differ significantly.
Results
Pulses as a group improved markers of blood sugar control in pooled trials, but results varied widely. Pinto beans on their own gave no clear change in one small trial.
Effect sizes as reported
Fasting glucose SMD -0.82 (pulses alone); HbA1c/fructosamine SMD -0.28 (low-GI diets).
Why this rating
Pooled results favour pulses, but heterogeneity was high and unexplained, the review is from 2009, and the only pinto trial found no change.
Form and dose studied
Whole pulses as food, varied amounts.
Who was studied
People with and without diabetes.
Limits
High, unexplained differences between trials; mixed pulse types; not a treatment for diabetes.
Why researchers looked
Beans are digested slowly, so researchers test whether eating them changes blood sugar.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Authoritative guidance
The 2009 review describes pulses as a source of slowly digestible carbohydrate, fibre and vegetable protein. This is a description, not a tested mechanism.
A proposed mechanism does not show that the effect happens in people.
People with diabetes who take blood sugar medicine should ask their clinic before changing their diet.
Fibre, plant protein and folate
High certaintyCooked pinto beans are a rich food source of fibre, protein and folate. A cup of cooked beans (171 g) has about 15.4 g of fibre, 15.4 g of protein and 294 micrograms of folate (DFE), by USDA data. These are nutrient facts, not a trial of pinto beans.
3 studiesBoiled pinto beans without salt. Canned and refried beans differ and …
Studies, doses and limits
What the trials found
USDA lists, for boiled pinto beans without salt, 9 g fibre, 9.01 g protein and 172 micrograms folate (DFE) per 100 g. MedlinePlus lists beans among soluble fibre foods and dried beans and peas (legumes) among natural folate sources, and says women thinking of pregnancy should take folic acid because food alone can be hard. Neither page names pinto beans.
Results
The roles of fibre and folate are well accepted and pinto beans contain both. No trial of pinto beans for bowel function or folate status was read.
Effect sizes as reported
USDA: 15.4 g fibre, 15.4 g protein and 294 micrograms folate DFE per cup of cooked beans (171 g).
Why this rating
High for pinto beans being a source of these nutrients (USDA data and health-agency statements). No pinto-specific trial was read for bowel function or folate levels.
Form and dose studied
Boiled pinto beans without salt. Canned and refried beans differ and were not read.
Who was studied
General adult diet.
Limits
A nutrient fact, not a trial of pinto beans. USDA does not split fibre into soluble and insoluble.
Why researchers looked
Pinto beans are mostly eaten for fibre, plant protein and folate, so people ask what those nutrients do.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Authoritative guidance
MedlinePlus says soluble fibre attracts water and turns to a gel that slows digestion, and insoluble fibre adds bulk to stool. Folate is a B vitamin.
A proposed mechanism does not show that the effect happens in people.
Fibre-rich beans can cause gas in some people; see the Safety tab.
Blood sugar after a meal (pulses versus other starches)
Low certaintyA review of 40 single-meal studies found that pulses gave lower blood sugar after the meal than other starchy foods, mostly wheat products or white rice, in 28 of 40 studies. Pinto beans were not singled out.
1 studiesPulses and pulse products as food, single meals.
Studies, doses and limits
What the trials found
A 2026 systematic review of 40 human intervention studies found lower glucose responses with non-oil-seed pulses than with control starchy foods in 28 of 40 studies, and lower insulin responses in 16 of 24. The authors conclude that pulses can lower blood sugar and blood fat after meals.
Results
Most single-meal studies saw lower after-meal blood sugar and insulin with pulses than with wheat products or white rice.
Effect sizes as reported
Glucose lower in 28 of 40 studies; insulin lower in 16 of 24.
Why this rating
The review counts studies and does not pool results. It covers many pulses and pulse products, and single meals do not show long-term effects.
Form and dose studied
Pulses and pulse products as food, single meals.
Who was studied
Adults in meal studies.
Limits
A count of studies, not a pooled effect; pinto beans not separated.
Why researchers looked
Pulses are slowly digested, so researchers measure blood sugar and insulin for hours after a meal.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Systematic review
Not tested in the abstract. The review calls pulses low-glycaemic foods.
A proposed mechanism does not show that the effect happens in people.
People who take blood sugar medicine should ask their clinic before changing their diet.
Hunger and fullness after a meal (pulses)
Mixed findingsIn the same review, 3 of 5 studies found less hunger after pulse meals, but only 1 of 6 found a clearly greater feeling of satiety and 3 of 6 found greater fullness. The picture is mixed.
1 studiesPulse-enriched meals.
Studies, doses and limits
What the trials found
The 2026 systematic review found a significantly reduced feeling of hunger after pulse-enriched meals in 3 of 5 studies (the other 2 showed a non-significant fall). For satiety, 1 of 6 studies found a significantly greater rise; for fullness, 3 of 6.
Results
Some studies found less hunger and more fullness after pulse meals. Most did not show a clear difference in satiety.
Effect sizes as reported
Hunger lower in 3 of 5 studies; satiety higher in 1 of 6; fullness higher in 3 of 6.
Why this rating
Few studies, mixed results, many pulse types, single meals.
Form and dose studied
Pulse-enriched meals.
Who was studied
Adults in meal studies.
Limits
Small counts of studies; no pinto-specific result.
Why researchers looked
Researchers ask whether the fibre and protein in beans make people feel full for longer.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Not established
Not established in the abstract.
A proposed mechanism does not show that the effect happens in people.
None specific.
Body weight (pulses as a group)
Low certaintyPooled trials found diets with pulses gave a very small extra weight loss, about 0.34 kg over roughly 6 weeks, compared with diets without pulses. It was not a trial of pinto beans alone.
1 studiesWhole pulses as food (trial detail: median 132 g a day, not advice).
Studies, doses and limits
What the trials found
A 2016 meta-analysis of 21 trials (940 participants, at least 3 weeks, median 6 weeks) found a weight change of -0.34 kg (95% CI -0.63 to -0.04, P = 0.03) with diets containing a median of 132 g of pulses a day. The effect was seen in weight-loss and in weight-maintaining diets. Six trials suggested a possible fall in body-fat percentage.
Results
Diets with pulses led to a small extra fall in weight in short trials.
Effect sizes as reported
Body weight -0.34 kg (95% CI -0.63 to -0.04).
Why this rating
A very small effect, short trials, mixed pulses, and the lower end of the CI is close to zero. Long-term weight loss was not tested.
Form and dose studied
Whole pulses as food (trial detail: median 132 g a day, not advice).
Who was studied
Adults in randomised trials.
Limits
Tiny average effect; not pinto beans alone.
Why researchers looked
Beans are filling, so researchers test whether adding them changes body weight.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Not established
Not established in the abstract.
A proposed mechanism does not show that the effect happens in people.
None specific.
Blood pressure (legumes as a group)
Mixed findingsPooled trials of legumes found no significant overall effect on blood pressure. But studies that follow people over time link eating more legumes to a lower risk of developing high blood pressure (relative risk 0.84). Trials and cohorts disagree, and neither is about pinto beans alone.
3 studiesLegumes as food, whole or powdered in the trials.
Studies, doses and limits
What the trials found
A 2023 meta-analysis of 16 trials (1,092 people, 4 to 52 weeks) found no significant overall effect on blood pressure: systolic -1.06 mmHg (95% CI -2.57 to 0.44), diastolic -0.48 mmHg (-1.06 to 0.10), certainty low. In people with overweight or obesity, systolic pressure was lower by 2.79 mmHg (-4.68 to -0.90). A 2026 meta-analysis of 12 cohort studies found the highest legume intake had a relative risk of 0.84 (95% CI 0.77 to 0.93) for hypertension; per 100 g a day the relative risk was 0.88 (0.80 to 0.97). A 2019 umbrella review found pulses with or without other legumes linked to lower hypertension incidence, RR 0.91 (0.86 to 0.97), very low certainty.
Results
Cohorts link more legumes to less new high blood pressure, but the pooled trials did not find a significant fall in blood pressure overall.
Effect sizes as reported
RCTs: systolic -1.06 mmHg (not significant). Cohorts: RR 0.84 (0.77-0.93); RR 0.91 (0.86-0.97).
Why this rating
Trials (low certainty) show no clear change; cohorts (very low certainty in the 2019 review) show a link that cannot prove cause. The 2026 cohort paper was funded by Plant-Based Health Professionals UK, which three authors belong to or direct; the paper says the funder had no role.
Form and dose studied
Legumes as food, whole or powdered in the trials.
Who was studied
Adults.
Limits
Mixed study types and legumes; no pinto-specific result.
Why researchers looked
Population studies ask whether people who eat more legumes get high blood pressure less often, and trials test whether adding legumes lowers readings.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Not established
Not established.
A proposed mechanism does not show that the effect happens in people.
People taking blood pressure medicine should not change it on their own.
Heart disease and early death (legumes, observational)
Low certaintyStudies that follow people for years link higher legume intake to a little less cardiovascular disease and a little lower risk of death from any cause (HR 0.94). These are associations and not about pinto beans alone.
3 studiesLegumes as food, grouped together.
Studies, doses and limits
What the trials found
A 2019 umbrella review of 28 cohort studies found the highest versus lowest pulse intake linked to lower incidence of cardiovascular disease (RR 0.92, 95% CI 0.85 to 0.99, low certainty), coronary heart disease (0.90, 0.83 to 0.99) and obesity (0.87, 0.81 to 0.94), but not heart attack, stroke or diabetes. A 2023 meta-analysis of 32 cohorts (1,141,793 people, 93,373 deaths) found higher legume intake linked to lower death from any cause (HR 0.94, 0.91 to 0.98) and from stroke (0.91, 0.84 to 0.99), but not from cardiovascular disease, coronary disease or cancer. Harvard Nutrition Source reports a meta-analysis of mostly observational studies linking about 4 servings a week with 14% lower coronary artery disease risk (secondary source).
Results
Higher legume intake went with slightly lower heart disease and early death in cohort studies. Observational data cannot show that legumes are the cause.
Effect sizes as reported
CVD RR 0.92 (0.85-0.99); all-cause death HR 0.94 (0.91-0.98); stroke death HR 0.91 (0.84-0.99).
Why this rating
Observational. The 2019 review grades certainty low for cardiovascular disease and very low for the others; the 2023 review grades it low to moderate. People who eat legumes may differ in other ways (diet, activity).
Form and dose studied
Legumes as food, grouped together.
Who was studied
Adults in cohort studies.
Limits
Association only; many legume types grouped; pinto beans not separated.
Why researchers looked
Researchers follow large groups of people to see whether those who eat more legumes live longer or have less heart disease.
Traditional use
Pinto beans are eaten as a food, dried and cooked, canned, or mashed as refried beans. Long use as food is not proof that it treats any condition.
Proposed mechanism Unknown
Not established. The studies are observational.
A proposed mechanism does not show that the effect happens in people.
None specific.
Connections to the rest of health
How Pinto Beans connects to the rest of our health knowledge graph. Every link says what kind of connection it is. A safety link (for example to the liver) is a warning, not a benefit. A study that merely mentions a topic never creates a benefit link.
Explore every connection: goals, body systems, organs, symptoms, genes
A. Wellness goals
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Cholesterol Balance | Low certainty | Cholesterol (pinto beans, one small trial): In one small trial of 16 adults, eating half a cup of pinto beans a day for 8 weeks lowered total cholesterol by 19 mg/dL and LDL ("bad") cholesterol by 14 mg/dL. Black-eyed peas and a carrot placebo did not. It is the only pinto-specific trial we read, so treat it as a promising hint, not proof. | 13 20 | |
| Heart Health | Low certainty | Cholesterol (pinto beans, one small trial): In one small trial of 16 adults, eating half a cup of pinto beans a day for 8 weeks lowered total cholesterol by 19 mg/dL and LDL ("bad") cholesterol by 14 mg/dL. Black-eyed peas and a carrot placebo did not. It is the only pinto-specific trial we read, so treat it as a promising hint, not proof. | 13 20 | |
| Cholesterol Balance | Demonstrated clinical effect | Moderate certainty | Cholesterol (beans and other pulses as a group): Pooled trials of pulses (beans, chickpeas, lentils and dried peas) found a small drop in LDL cholesterol, about 0.14 to 0.17 mmol/L. The newest review rates the certainty moderate-to-high for pulses as a group. Pinto beans were not separated out. | 2 1 |
| Heart Health | Demonstrated clinical effect | Moderate certainty | Cholesterol (beans and other pulses as a group): Pooled trials of pulses (beans, chickpeas, lentils and dried peas) found a small drop in LDL cholesterol, about 0.14 to 0.17 mmol/L. The newest review rates the certainty moderate-to-high for pulses as a group. Pinto beans were not separated out. | 2 1 |
| Blood Sugar Balance | Mixed findings | Blood sugar markers (pulses as a group): Pooled trials of pulses found lower fasting glucose and lower longer-term markers (HbA1c or fructosamine) when pulses were part of low-GI or high-fibre diets. Trials differed a lot. The one pinto bean trial found no change in glucose, insulin or HbA1c. | 9 13 | |
| Metabolic Health | Mixed findings | Blood sugar markers (pulses as a group): Pooled trials of pulses found lower fasting glucose and lower longer-term markers (HbA1c or fructosamine) when pulses were part of low-GI or high-fibre diets. Trials differed a lot. The one pinto bean trial found no change in glucose, insulin or HbA1c. | 9 13 | |
| Digestive Support | High certainty | Fibre, plant protein and folate: Cooked pinto beans are a rich food source of fibre, protein and folate. A cup of cooked beans (171 g) has about 15.4 g of fibre, 15.4 g of protein and 294 micrograms of folate (DFE), by USDA data. These are nutrient facts, not a trial of pinto beans. | 27 20 21 | |
| Preventive Wellness | High certainty | Fibre, plant protein and folate: Cooked pinto beans are a rich food source of fibre, protein and folate. A cup of cooked beans (171 g) has about 15.4 g of fibre, 15.4 g of protein and 294 micrograms of folate (DFE), by USDA data. These are nutrient facts, not a trial of pinto beans. | 27 20 21 | |
| Blood Sugar Balance | Low certainty | Blood sugar after a meal (pulses versus other starches): A review of 40 single-meal studies found that pulses gave lower blood sugar after the meal than other starchy foods, mostly wheat products or white rice, in 28 of 40 studies. Pinto beans were not singled out. | 8 | |
| Weight Management | Mixed findings | Hunger and fullness after a meal (pulses): In the same review, 3 of 5 studies found less hunger after pulse meals, but only 1 of 6 found a clearly greater feeling of satiety and 3 of 6 found greater fullness. The picture is mixed. | 8 | |
| Weight Management | Low certainty | Body weight (pulses as a group): Pooled trials found diets with pulses gave a very small extra weight loss, about 0.34 kg over roughly 6 weeks, compared with diets without pulses. It was not a trial of pinto beans alone. | 5 | |
| Blood Pressure Support | Mixed findings | Blood pressure (legumes as a group): Pooled trials of legumes found no significant overall effect on blood pressure. But studies that follow people over time link eating more legumes to a lower risk of developing high blood pressure (relative risk 0.84). Trials and cohorts disagree, and neither is about pinto beans alone. | 7 6 11 | |
| Heart Health | Mixed findings | Blood pressure (legumes as a group): Pooled trials of legumes found no significant overall effect on blood pressure. But studies that follow people over time link eating more legumes to a lower risk of developing high blood pressure (relative risk 0.84). Trials and cohorts disagree, and neither is about pinto beans alone. | 7 6 11 | |
| Heart Health | Low certainty | Heart disease and early death (legumes, observational): Studies that follow people for years link higher legume intake to a little less cardiovascular disease and a little lower risk of death from any cause (HR 0.94). These are associations and not about pinto beans alone. | 11 15 18 | |
| Healthy Aging | Low certainty | Heart disease and early death (legumes, observational): Studies that follow people for years link higher legume intake to a little less cardiovascular disease and a little lower risk of death from any cause (HR 0.94). These are associations and not about pinto beans alone. | 11 15 18 |
B. Body systems
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Cardiovascular System | Biological association | Low certainty | Studied for: Cholesterol (pinto beans, one small trial) Studied for: Cholesterol (beans and other pulses as a group) | 13 20 2 1 7 6 11 15 18 |
| Endocrine System | Biological association | Mixed findings | Studied for: Blood sugar markers (pulses as a group) Studied for: Blood sugar after a meal (pulses versus other starches) | 9 13 8 |
| Metabolism Weight | Biological association | Mixed findings | Studied for: Blood sugar markers (pulses as a group) Studied for: Hunger and fullness after a meal (pulses) | 9 13 8 5 |
| Digestive System | Biological association | High certainty | Studied for: Fibre, plant protein and folate Studied for: Hunger and fullness after a meal (pulses) | 27 20 21 8 |
| Nutrition | Biological association | High certainty | Studied for: Fibre, plant protein and folate | 27 20 21 |
C. Body parts and organs
E. Health conditions
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Food allergy | Adverse effect or risk | Documented risk | Bean allergy is possible; no pinto-specific source was found. Preparation or compound: Bean proteins |
22 |
| Kidney disease | Authoritative guidance | People with kidney problems may need to limit potassium-rich foods. Preparation or compound: Potassium in beans |
23 27 |
I. Biomarkers
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| LDL cholesterol | Biological association | Moderate certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 13 2 1 |
| Total cholesterol | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 13 |
| Fasting blood glucose | Biological association | Mixed findings | Measured in trials: mixed. A lab change is not the same as a health benefit. | 9 13 |
| Body weight | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 5 |
| Systolic blood pressure | Biological association | Low certainty | Measured in trials: no-change. A lab change is not the same as a health benefit. | 7 |
| Blood glucose after a meal | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 8 |
K. Biological pathways
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Fibre | Preliminary mechanism | Human | Beans are a fibre food; soluble fibre is linked to lower cholesterol. | 20 27 |
| Folate | Preliminary mechanism | Human | Beans are a natural folate source. | 21 27 |
| Potassium | Preliminary mechanism | Human | Beans contain potassium; relevant for kidney disease. | 23 27 |
L. Active compounds
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Phytohaemagglutinin (PHA) | Adverse effect or risk | Documented risk | A lectin that causes vomiting and diarrhoea if beans are not fully cooked; documented for red kidney beans. A lectin that causes vomiting and diarrhoea if beans are raw or undercooked; documented for red kidney beans. Preparation or compound: Raw or undercooked beans |
16 12 3 |
| Dietary fibre | Biological association | Human | MedlinePlus lists beans as a soluble fibre food; soluble fibre helps lower cholesterol, insoluble fibre adds stool bulk. Preparation or compound: Seed |
27 26 20 |
| Protein | Biological association | Composition data | A plant protein source; no pinto-specific trial of its effect was read. Preparation or compound: Seed |
27 26 |
| Folate (vitamin B9) | Biological association | Human | B vitamin; dried beans and peas are natural sources (MedlinePlus). Preparation or compound: Seed |
27 21 24 |
| Resistant starch and oligosaccharides | Biological association | Review | Gut bacteria ferment them, which feeds helpful bacteria and makes gas in some people (Harvard Nutrition Source, secondary source). Preparation or compound: Seed |
18 14 |
| Phytohaemagglutinin (PHA) | Biological association | Human | A lectin in raw or undercooked beans that causes nausea, vomiting and diarrhoea; destroyed by soaking and boiling. Preparation or compound: Seed |
16 10 12 |
| Phytic acid (phytate) | Biological association | Review | Named with tannins and lectins as an antinutrient that can hinder mineral absorption; processing lowers it (2026 review). Preparation or compound: Seed |
4 25 |
| Potassium and phosphorus | Biological association | Human | Relevant for people with kidney disease who limit these minerals (MedlinePlus). Preparation or compound: Seed |
27 23 |
Each connection is stored with the ingredient, the connected record, the kind of connection, the evidence status, the supporting studies, the preparation or compound involved, and a review date (last reviewed October 26, 2026).
The evidence
The research centre for Pinto Beans. Every record here was checked against PubMed or the publisher's page; we never list a study we have not verified.
Evidence by outcome
Bars show how many studies we found for each outcome, not how well it works. People are added up across trials only (reviews are not added, to avoid double counting).
How we rate evidence
High certainty
Several well-run trials or reviews agree; further research is unlikely to change the picture much.
Moderate certainty
Good trials point the same way, but some doubt remains.
Low certainty
Small, short or inconsistent trials. The finding could change with better research.
Very low certainty
Very little or very weak human data. Treat as a possibility only.
Mixed findings
Trials or reviews disagree with each other.
Not enough evidence
Not enough human research to say either way.
Evidence against
Good research found no benefit, or found harm.
We take the reviewers' own risk-of-bias and GRADE statements where they exist, and otherwise judge from study size, design, consistency, directness and whether a product matches what is sold. Many publications do not make evidence high. Method note: We started from our existing pinto bean summary, re-checked nutrition against USDA FoodData Central data, read the health agency pages (FDA, MedlinePlus) and the Harvard Nutrition Source, and searched PubMed for trials, reviews and safety reports. Only abstracts were read for studies. Items we could not verify are flagged in the research gaps.
Study library: every study we checked 27
| Study | Design | People | Product, dose, length | Result |
|---|---|---|---|---|
| Back 2026 Effect of Different Types of Whole Dietary Pulses on Established Therapeutic Lipid Targets for Cardiovascular Risk Reduction: An Updated Systematic Review and Dose-Response Meta-Analysis of Randomized Controlled Trials. J Am Heart Assoc · PMID 42132198 · DOI |
Systematic review meta analysis |
2095 38 randomised trials (52 comparisons; 2,095 adults), at least 3 weeks, median 6 weeks |
Whole dietary pulses (beans, chickpeas, dried peas, lentils) Whole pulses as food Median 130 g a day, 0.5 to 0.67 cup (trial detail, not advice) Median 6 weeks · vs Control diets |
Whole pulses lowered LDL cholesterol, non-HDL cholesterol and apoB, with a very small fall in HDL cholesterol. Results were similar across pulse types. For beans there was a straight-line link between amount and LDL fall up to 1 cup a day. GRADE certainty was moderate-to-high for all outcomes except apoB (very low). LDL -0.14 mmol/L; non-HDL -0.22 mmol/L; apoB -0.08 g/L; HDL -0.03 mmol/L; beans: LDL -0.25 mmol/L per 0.5 cup (LDL 95% CI -0.19 to -0.08; non-HDL -0.30 to -0.14; apoB -0.13 to -0.03; HDL -0.05 to -0.01; beans -0.48 to -0.02) Methods, limits and fundingOutcomes: LDL cholesterol (primary), non-HDL, apoB, HDL and other lipids Limitations: Short trials (median 6 weeks). The abstract does not break results down for pinto beans. The authors say more studies of chickpeas, dried peas and lentils are needed. Funding and conflicts: One author lists Protein Industries Canada as an affiliation (an industry-linked body); funding and conflict statements are not in the abstract, so independence is unclear. Registered as PROSPERO CRD42023432826. Read: abstract |
| Ha 2014 Effect of dietary pulse intake on established therapeutic lipid targets for cardiovascular risk reduction: a systematic review and meta-analysis of randomized controlled trials. CMAJ · PMID 24710915 · DOI |
Systematic review meta analysis |
1037 26 randomised trials (1,037 adults), each at least 3 weeks |
Diets emphasising pulses (beans, chickpeas, lentils and peas) Whole pulses as food Median 130 g a day (trial detail, not advice) At least 3 weeks · vs Isocaloric diets without pulses |
Diets emphasising pulses lowered LDL cholesterol compared with control diets. No effect was seen on apolipoprotein B or non-HDL cholesterol. LDL mean difference -0.17 mmol/L (95% CI -0.25 to -0.09 mmol/L) Methods, limits and fundingOutcomes: LDL cholesterol, apolipoprotein B, non-HDL cholesterol Limitations: Mixed pulses, not pinto beans alone. The authors call for longer, higher-quality trials. Funding and conflicts: The PubMed record lists non-US government research support; other funding and conflicts are not in the abstract. Registered as NCT01594567. Read: abstract |
| Haile 2026 Severe red kidney beans toxicity in an 8-year-old girl: a rare case of hypovolemic shock and prerenal acute kidney injury. Int J Emerg Med · PMID 41714947 · DOI |
Case report |
1 One 8-year-old girl after a home-cooked red kidney bean dish |
Red kidney beans, insufficiently cooked (home-cooked dish) Kidney beans Single event |
The child lost consciousness, had very low blood pressure and a slow heart rate, and needed CPR and fluids. Dehydration and a prerenal kidney injury were found. With supportive care she recovered and creatinine was 0.5 mg/dL after 24 hours. The report says no antidote exists for PHA, and symptoms usually start 1 to 3 hours after eating. One recovered case (Not applicable) Methods, limits and fundingOutcomes: Shock and kidney function after red kidney bean lectin poisoning Limitations: A single case of red kidney beans. Rare. It does not show how often pinto beans cause this. Funding and conflicts: No competing interests declared. Read: abstract |
| Janahar 2026 Nutritional and Functional Attributes of Legumes: A Review of Processing Methods and Their Impacts. J Food Sci · PMID 42494153 · DOI |
Narrative review n/a |
Review of processing methods for legumes | Legumes: soaking, germination, fermentation, heat and other processing Legumes as food |
Phytic acid, tannins, lectins and trypsin inhibitors can hinder mineral absorption and protein breakdown. Fermentation cut phytates, tannins and saponins by more than 60%. Soaking raised soluble fibre by up to 33% but lowered phenolics and minerals leached into the water. Heat neutralises heat-sensitive antinutrients but may lower antioxidant capacity by 50 to 95%. Not applicable (Not applicable) Methods, limits and fundingOutcomes: Antinutritional factors and nutrition value after processing Limitations: A review of processing in legumes in general, not pinto beans. It does not show an effect on health in a mixed diet. Funding and conflicts: No conflicts declared. Read: abstract |
| Kim 2016 Effects of dietary pulse consumption on body weight: a systematic review and meta-analysis of randomized controlled trials. Am J Clin Nutr · PMID 27030531 · DOI |
Systematic review meta analysis |
940 21 randomised trials (940 participants), at least 3 weeks |
Diets containing whole dietary pulses (beans, lentils, chickpeas, dry peas) Whole pulses as food Median 132 g a day (trial detail, not advice) Median 6 weeks · vs Diets without pulses |
Diets with pulses gave a small extra weight loss compared with diets without pulses. The effect was seen in weight-loss diets and in weight-maintaining diets. Six trials suggested a possible fall in body-fat percentage. Body weight -0.34 kg (95% CI -0.63 to -0.04 kg; P = 0.03) Methods, limits and fundingOutcomes: Body weight, waist circumference, body fat Limitations: A very small average change over a short period. Mixed pulses. Long-term weight loss was not tested. Funding and conflicts: Funding and conflicts are not in the abstract. Registered as NCT01594567. Read: abstract |
| Metoudi 2026 Legume and soy consumption and the risk of hypertension: a systematic review and dose-response meta-analysis of prospective studies. BMJ Nutr Prev Health · PMID 42539997 · DOI |
Systematic review meta analysis |
309853 12 prospective cohort studies; legumes: 10 studies, 86,098 cases among 309,853 people |
Legume intake (usual diet) Legumes as food Highest versus lowest; per 100 g a day Prospective follow-up · vs Lowest intake |
Higher legume intake was linked to a lower risk of developing high blood pressure. Differences between studies were large (I2 65%). The authors rated causality as probable by their criteria. Relative risk 0.84 (high versus low); 0.88 per 100 g a day (0.77-0.93; per 100 g/day 0.80-0.97) Methods, limits and fundingOutcomes: New high blood pressure (hypertension) Limitations: Observational: cannot show cause. Legumes in general. Publication bias signal for legumes (Egger p = 0.04), which the authors attribute to two outlying studies. Funding and conflicts: Funded by Plant-Based Health Professionals UK. Two authors are members and one is its director; the paper says the funder had no role in design, data collection, analysis or interpretation. Read: abstract |
| Reyneke 2023 The Effect of Non-Oil Seed Legume Intake on Blood Pressure: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Adv Nutr · PMID 37031751 · DOI |
Systematic review meta analysis |
1092 16 randomised trials (1,092 participants), 4 to 52 weeks |
Non-oil-seed legumes, whole or powdered Whole or powdered legumes Weekly amounts of 450 to 3,150 g across trials 4 to 52 weeks · vs Comparator diets |
There was no significant overall effect of legumes on blood pressure. Certainty was low. In people with overweight or obesity, systolic pressure was lower. Systolic -1.06 mmHg; diastolic -0.48 mmHg; overweight/obese subgroup systolic -2.79 mmHg (Systolic -2.57 to 0.44; diastolic -1.06 to 0.10; subgroup -4.68 to -0.90) Methods, limits and fundingOutcomes: Systolic and diastolic blood pressure Limitations: The subgroup result is a secondary finding. Mixed legumes in whole or powdered form. The authors call for large, high-quality trials. Funding and conflicts: Funding and conflicts are not in the abstract. Registered as PROSPERO CRD42021237732. Read: abstract |
| Schiemann 2026 Acute Effects of Non-Oil-Seed Pulses on Parameters of Cardiometabolic Health: A Systematic Review of Human Intervention Studies. Nutr Rev · PMID 41317035 · DOI |
Systematic review |
40 human intervention studies of single-meal (acute) effects of pulses | Non-oil-seed pulses and pulse products Whole pulses and pulse products Single meals Single-meal studies · vs Mainly wheat-flour products or white rice |
Pulses gave lower after-meal glucose in 28 of 40 studies and lower insulin in 16 of 24 studies than other starchy foods. Hunger was reduced in 3 of 5 studies (the other 2 not significantly). Satiety was greater in only 1 of 6 studies and fullness in 3 of 6. Blood fats and vessel function were studied in few trials, mostly with no significant effects. Counts of studies: glucose 28 of 40; insulin 16 of 24; hunger 3 of 5; satiety 1 of 6; fullness 3 of 6 (Not applicable (counts, no pooled estimate in the abstract)) Methods, limits and fundingOutcomes: After-meal glucose, insulin, hunger, fullness, satiety, blood fats, vessel function Limitations: A count of studies, not a pooled result. Mixed pulses and pulse products; not pinto beans alone. Single meals do not show long-term effects. Funding and conflicts: No conflicts declared in the record. Read: abstract |
| Sievenpiper 2009 Effect of non-oil-seed pulses on glycaemic control: a systematic review and meta-analysis of randomised controlled experimental trials in people with and without diabetes. Diabetologia · PMID 19526214 · DOI |
Systematic review meta analysis |
41 randomised trials of at least 7 days in people with and without diabetes | Non-oil-seed pulses (chickpeas, beans, peas, lentils) alone, or within low-GI or high-fibre diets Whole pulses as food Varied At least 7 days · vs Control diets |
Pulses alone (11 trials) lowered fasting glucose and insulin. Pulses in low-GI diets (19 trials) lowered HbA1c or fructosamine. Pulses in high-fibre diets (11 trials) lowered fasting glucose and HbA1c or fructosamine. Differences between trials were high and mostly unexplained. Standardised mean differences: fasting glucose -0.82 (pulses alone); HbA1c/fructosamine -0.28 (low-GI diets) (Fasting glucose -1.36 to -0.27; insulin -0.49 (-0.93 to -0.04); low-GI diets -0.42 to -0.14; high-fibre: glucose -0.49 to -0.15, HbA1c/fructosamine -0.45 to -0.09) Methods, limits and fundingOutcomes: Fasting glucose, fasting insulin, HbA1c or fructosamine Limitations: High, unexplained differences between trials. Mixed pulses, not pinto beans alone. The authors call for large, well-designed trials. Funding and conflicts: The PubMed record lists non-US government research support; other funding and conflicts are not in the abstract. Read: abstract |
| Thompson 2025 Toward Standardized Measurement of Active Phytohemagglutinin in Common Bean, Phaseolus vulgaris, L. Foods · PMID 41464957 · DOI |
Laboratory analysis laboratory |
Dark red kidney beans (DRK) and commercially canned beans tested in the laboratory | Raw and canned beans (laboratory assay) Bean seeds Laboratory · vs ELISA versus hemagglutination assay |
Dark red kidney beans held an estimated 223 +/- 0.07 mg of active lectin per gram dry weight (about 544 mg in four seeds). Commercially cooked canned beans had more than 99% less PHA (4.9 micrograms per gram dry weight). The authors estimate an entire can would hold about 1,000-fold less PHA than the amount estimated to be linked to food poisoning. The paper notes reports that four to five soaked raw dark red kidney beans can cause food poisoning. DRK 223 mg/g dry weight; canned beans 4.9 micrograms/g (more than 99% lower) (Mean +/- 0.07 for DRK; no CI) Methods, limits and fundingOutcomes: Active phytohemagglutinin (PHA) in beans Limitations: Dark red kidney beans, not pinto beans. A methods paper rather than a health study. Funding and conflicts: The authors declare no conflicts; funders had no role (named in the paper, not in the abstract). Read: abstract |
| Viguiliouk 2019 Associations between Dietary Pulses Alone or with Other Legumes and Cardiometabolic Disease Outcomes: An Umbrella Review and Updated Systematic Review and Meta-analysis of Prospective Cohort Studies. Adv Nutr · PMID 31728500 · DOI |
Umbrella review |
Six systematic reviews updated to 28 prospective cohort studies | Dietary pulses with or without other legumes (usual intake) Whole pulses and legumes as food Highest versus lowest intake Follow-up in cohorts · vs Lowest intake |
Highest versus lowest intake was linked to lower incidence of cardiovascular disease, coronary heart disease, high blood pressure and obesity. No link was found with heart attack, stroke or diabetes incidence, or with cardiovascular, coronary or stroke death. Certainty was low for cardiovascular disease and very low for all the others. Relative risk: CVD 0.92; CHD 0.90; hypertension 0.91; obesity 0.87 (CVD 0.85-0.99; CHD 0.83-0.99; hypertension 0.86-0.97; obesity 0.81-0.94) Methods, limits and fundingOutcomes: Cardiovascular disease, coronary heart disease, heart attack, stroke, diabetes, high blood pressure, obesity Limitations: Observational: cannot show cause. Pulses grouped with other legumes. Prepared to update diabetes-guideline recommendations. Funding and conflicts: Funding and conflicts are not in the abstract. Registered as NCT03555734. Read: abstract |
| Watier-Grillot 2023 From Foodborne Disease Outbreak (FBDO) to Investigation: The Plant Toxin Trap, Brittany, France, 2018. Toxins (Basel) · PMID 37505726 · DOI |
Outbreak investigation |
200 200 cases among 1,700 people (attack rate 12%) at a military dining facility in Brittany, France, 2018 |
Chili con carne made with undercooked raw kidney beans Kidney beans Outbreak, 5 July 2018 · vs Controls (case-control study, 92 cases and 113 controls) |
Symptoms were mainly lower digestive and began fast (median 3.3 hours). The chili con carne was the likely source. Phytohaemagglutinin was above the potentially toxic dose (400 HAU/gram) in the food, and the raw kidney beans had very high activity (66,667 HAU/gram). They were undercooked. Attack rate 12%; median incubation 3.3 h; PHA above 400 HAU/g in chili (Not given in the abstract) Methods, limits and fundingOutcomes: Gastroenteritis and phytohaemagglutinin in food Limitations: Kidney beans, not pinto beans. One outbreak. Funding and conflicts: No conflicts declared. Read: abstract |
| Winham 2007 Pinto bean consumption reduces biomarkers for heart disease risk. J Am Coll Nutr · PMID 17634169 · DOI |
Controlled trial |
16 16 free-living, mildly insulin-resistant adults (7 men, 9 women); randomised 3x3 crossover |
Pinto beans, black-eyed peas or carrots (placebo) Beans as food Half a cup a day (trial detail, not advice) 8 weeks per phase, 2-week washouts · vs Black-eyed peas and carrots |
Over 8 weeks total cholesterol changed by -19 mg/dL with pinto beans, +2.5 with black-eyed peas and +1 with the carrot placebo. LDL changed by -14, +4 and +1 mg/dL. Pinto beans differed from placebo. No significant differences were seen in the other blood measures. Total cholesterol -19 +/- 5 mg/dL; LDL -14 +/- 4 mg/dL (pinto) versus +1 +/- 4 (placebo) (Not given in the abstract (p = 0.011 total cholesterol; p = 0.013 LDL)) Methods, limits and fundingOutcomes: Total and LDL cholesterol, HDL, triglycerides, hs-CRP, insulin, glucose, HbA1c Limitations: Only 16 people, one trial. The abstract does not describe blinding or who paid. Cholesterol is a marker, not a heart attack count. Funding and conflicts: The PubMed record lists US government (non-PHS) research support; funder details and conflicts are not in the abstract. Read: abstract |
| Winham 2011 Perceptions of flatulence from bean consumption among adults in 3 feeding studies. Nutr J · PMID 22104320 · DOI |
Controlled trial |
Adults in three feeding studies: Study 1 n=17 (crossover), Study 2 n=29 (crossover), Study 3 n=80 (40 pinto beans, 40 control soup; parallel) | Pinto beans, baked beans or black-eyed peas versus canned carrots or a control soup Beans as food Half a cup a day (trial detail, not advice) 8 or 12 weeks · vs Canned carrots or control soup |
Fewer than 50% reported more flatulence from pinto or baked beans in the first week, but only 19% with black-eyed peas. A small share (3 to 11%) reported more flatulence even on control diets. The authors conclude concerns about excessive gas may be exaggerated, and that people vary by bean type. Under 50% more flatulence with pinto or baked beans in week 1; 19% with black-eyed peas; 3-11% on controls (Not given in the abstract) Methods, limits and fundingOutcomes: Weekly questionnaire: flatulence, stool changes, bloating Limitations: Self-reported questionnaire; participants were from heart-disease-marker trials, not a gut study. The abstract does not give funding details. Funding and conflicts: Funding and conflicts are not in the abstract. Read: abstract |
| Zargarzadeh 2023 Legume Consumption and Risk of All-Cause and Cause-Specific Mortality: A Systematic Review and Dose-Response Meta-Analysis of Prospective Studies. Adv Nutr · PMID 36811595 · DOI |
Systematic review meta analysis |
1141793 32 cohorts (31 publications), 1,141,793 participants, 93,373 deaths |
Legume intake (usual diet) Legumes as food Highest versus lowest; per 50 g a day Prospective follow-up · vs Lowest intake |
Higher legume intake was linked to lower death from any cause and from stroke. No significant link was found for cardiovascular, coronary heart disease or cancer death. Certainty was low to moderate. All-cause mortality HR 0.94; stroke mortality HR 0.91; per 50 g a day HR 0.94 (All-cause 0.91-0.98; stroke 0.84-0.99; per 50 g/day 0.89-0.99) Methods, limits and fundingOutcomes: Death from any cause, cardiovascular disease, coronary heart disease, stroke and cancer Limitations: Observational: cannot show cause. Legumes in general, not pinto beans alone. Funding and conflicts: Funding and conflicts are not in the abstract. Read: abstract |
| s-fda-natural-toxins FDA: Natural Toxins in Food · Source |
Health agency n/a |
Methods, limits and fundingRead: full-text | ||
| s-gbif-phaseolus-vulgaris GBIF species match: Phaseolus vulgaris L. · Source |
Reference database n/a |
Methods, limits and fundingRead: api | ||
| s-harvard-legumes Harvard T.H. Chan School of Public Health: The Nutrition Source, Legumes · Source |
Secondary reference n/a |
Methods, limits and fundingRead: full-text | ||
| s-healthcanada-lectins Health Canada: Lectins in Dry Legumes · Source |
Health agency n/a |
Methods, limits and fundingRead: summary-only | ||
| s-medlineplus-fiber MedlinePlus: Fiber · Source |
Health agency n/a |
Methods, limits and fundingRead: full-text | ||
| s-medlineplus-folate MedlinePlus: Folic acid in the diet · Source |
Health agency n/a |
Methods, limits and fundingRead: full-text | ||
| s-medlineplus-foodallergy MedlinePlus: Food allergy · Source |
Health agency n/a |
Methods, limits and fundingRead: full-text | ||
| s-medlineplus-potassium MedlinePlus: Potassium in diet · Source |
Health agency n/a |
Methods, limits and fundingRead: full-text | ||
| s-pubchem-folic-acid PubChem: Folic acid (CID 135398658) · Source |
Reference database n/a |
Methods, limits and fundingRead: api | ||
| s-pubchem-phytate PubChem: Phytate / phytic acid (CID 890) · Source |
Reference database n/a |
Methods, limits and fundingRead: api | ||
| s-usda-fdc-175199 USDA FoodData Central: Beans, pinto, mature seeds, raw (FDC 175199) · Source |
Reference database n/a |
Methods, limits and fundingRead: saved-copy | ||
| s-usda-fdc-175200 USDA FoodData Central: Beans, pinto, mature seeds, cooked, boiled, without salt (SR Legacy, FDC 175200) · Source |
Reference database n/a |
Methods, limits and fundingRead: saved-copy |
What we do not know yet
- Only one small trial of pinto beans on their own was found (cholesterol); no trial of pinto beans on blood pressure, weight, hunger or heart disease.
- The pooled trials and cohorts mix beans, lentils, chickpeas, peas and other legumes; a pinto-only result was not in the abstracts read.
- The PHA content of pinto beans was not found; the figures read are for red kidney beans. Health Canada's lectin page could not be re-opened.
- Pinto bean allergy, FODMAP rating, oxalate, purines (gout), pesticide residues, heavy metals, choking risk for young children and pinto-specific pregnancy advice were not researched.
How new research is added
New studies are found by a saved PubMed search and placed in a review queue before the page changes.
Lab markers
What changed in blood or saliva tests during trials. A changed number is not the same as feeling or being healthier, and we give no "normal ranges".
Metabolic 4
LDL cholesterol
Lowered in trials
The "bad" cholesterol carried in the blood. Higher levels are linked to more heart disease.
Moderate certaintyResults and what it means
Why it was measured
It is the usual blood marker used in diet trials for heart risk.
Statistical vs. clinical meaning
A small fall in a blood marker, seen in pooled trials of pulses. It does not show fewer heart attacks, and pinto beans were tested alone in only one very small trial.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 13 | LDL -14 +/- 4 mg/dL with pinto beans versus +1 +/- 4 with the carrot placebo and +4 +/- 5 with black-eyed peas | 16 adults with mild insulin resistance | Half a cup of pinto beans a day for 8 weeks |
| 2 | LDL -0.17 mmol/L (95% CI -0.25 to -0.09); no effect on apoB or non-HDL | 1,037 adults in 26 trials | Diets emphasising pulses, median 130 g a day |
| 1 | LDL -0.14 mmol/L (95% CI -0.19 to -0.08); non-HDL -0.22 (-0.30 to -0.14); apoB -0.08 g/L (-0.13 to -0.03) | 2,095 adults in 38 trials | Whole dietary pulses, median 6 weeks |
Total cholesterol
Lowered in trials
All the cholesterol in the blood, including LDL and HDL.
Low certaintyResults and what it means
Why it was measured
It is a basic blood fat test reported in many diet trials.
Statistical vs. clinical meaning
One small trial only; no pinto repeat was found.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 13 | Total cholesterol -19 +/- 5 mg/dL with pinto beans versus +1 +/- 5 with the carrot placebo and +2.5 +/- 6 with black-eyed peas | 16 adults | Half a cup of pinto beans a day for 8 weeks |
Fasting blood glucose
Mixed results in trials
Blood sugar measured after not eating overnight.
Mixed findingsResults and what it means
Why it was measured
It shows how well the body is handling sugar between meals.
Statistical vs. clinical meaning
Pooled trials lean towards a lower glucose but differ a lot, and the only pinto trial saw no change.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 9 | Pulses alone lowered fasting glucose (SMD -0.82, 95% CI -1.36 to -0.27) with high unexplained differences between trials | 11 of 41 trials, people with and without diabetes | Pulses alone, at least 7 days |
| 13 | No significant difference in glucose, insulin or HbA1c | 16 adults | Half a cup of pinto beans a day for 8 weeks |
Body weight
Lowered in trials
How much a person weighs, in kilograms.
Low certaintyResults and what it means
Why it was measured
It is the basic outcome in weight trials.
Statistical vs. clinical meaning
A very small average fall in short trials of pulses as a group.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 5 | -0.34 kg (95% CI -0.63 to -0.04) | 940 participants in 21 trials | Diets with pulses, median 132 g a day, median 6 weeks |
Other 2
Systolic blood pressure
No clear change in trials
The top number in a blood pressure reading, in mmHg.
Low certaintyResults and what it means
Why it was measured
High blood pressure raises the risk of heart disease and stroke.
Statistical vs. clinical meaning
No clear overall change in pooled trials. The subgroup finding needs confirming.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 7 | -1.06 mmHg (95% CI -2.57 to 0.44), not significant; overweight or obese subgroup -2.79 mmHg (-4.68 to -0.90) | 1,092 participants in 16 trials | Legumes, whole or powdered, 4 to 52 weeks |
Blood glucose after a meal
Lowered in trials
Blood sugar measured for hours after eating.
Low certaintyResults and what it means
Why it was measured
It shows how strongly a meal raises blood sugar.
Statistical vs. clinical meaning
Mostly lower after-meal sugar with pulses, counted by study, not pooled.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 8 | Lower after-meal glucose in 28 of 40 studies and lower insulin in 16 of 24 studies, versus mainly wheat products or white rice | 40 single-meal studies | Non-oil-seed pulses and pulse products |
Safety
What studies and official sources say about side effects, medicines and who should check first. Each point shows what kind of evidence it comes from.
Main points to know 6
- Raw or undercooked beans can cause food poisoning (lectin PHA). The FDA says phytohaemagglutinin (PHA) is a lectin found in raw or undercooked beans, and that at high levels in raw beans it can cause nausea, severe vomiting and diarrhea. Soaking beans for at least 5 hours and then boiling them in fresh water for at least 30 minutes removes and destroys it. The FDA says the low levels in canned and properly cooked kidney beans do not matter. The numbers and cases we read are for red (kidney) beans, not pinto beans: a French outbreak in 2018 (200 ill of 1,700, median 3.3 hours to symptoms) traced to undercooked raw kidney beans in chili, a laboratory study (dark red kidney beans held 223 mg of active lectin per gram dry weight; canned beans had more than 99% less), and a 2026 case report of an 8-year-old girl who went into shock after a red kidney bean dish and recovered with supportive care. Pinto beans are the same species (Phaseolus vulgaris) but no source we read measured PHA in pinto beans. Cook dried pinto beans fully; do not eat them raw. Authoritative guidance 16 10 12 3 19
- Gas, bloating and cramps are common but often milder than feared. Beans contain resistant starch and oligosaccharides that gut bacteria ferment, which makes gas, bloating and cramping in some people (Harvard Nutrition Source). In three feeding studies of half a cup a day, fewer than half of people reported more flatulence from pinto or baked beans in the first week, 19% with black-eyed peas, and 3 to 11% even on control diets. Harvard says soaking dried beans for at least three hours and cooking may help. Ask a dietitian if beans upset your gut or you have irritable bowel syndrome. No official FODMAP rating for pinto beans was read. Controlled trial 14 18
- Allergy to beans is possible; pinto-specific data was not found. MedlinePlus says food allergy symptoms range from itching in the mouth, hives, swelling and vomiting to wheezing and trouble breathing, and that anaphylaxis is a medical emergency (call 911). We did not find a source on how common pinto bean allergy is or on cross-reaction with other legumes such as peanuts or soy. Ask an allergist if you have reacted to beans or other legumes. Authoritative guidance 22
- Potassium: ask your kidney team if you have a potassium limit. USDA lists 436 mg of potassium and 147 mg of phosphorus per 100 g of boiled pinto beans without salt (746 mg and 251 mg per cup of 171 g). MedlinePlus says people with kidney problems, particularly those on dialysis, should not eat too many potassium-rich foods and that a provider will advise a potassium-restricted diet if needed. MedlinePlus does not name beans; the link is our reading of two facts. Authoritative guidance 23 27
- Canned and refried beans are different products. The USDA values on this page are for boiled pinto beans cooked without salt. Canned and refried beans usually contain added salt or fat, so their numbers differ. Harvard advises checking labels for added sodium in processed legume products. We did not read sodium values for canned or refried pinto beans. Authoritative guidance 18 27
- Natural compounds can reduce mineral absorption from beans. A 2026 review says beans contain phytic acid, tannins, lectins and trypsin inhibitors that can hinder mineral absorption and protein breakdown, and that soaking, germination, fermentation and heat reduce them. It does not show a health effect in a mixed diet. We found no pinto-specific study of how much this matters. Narrative review 4
Side effects 3
| Effect | How often | Severity and recovery | Evidence |
|---|---|---|---|
| Nausea, severe vomiting and diarrhoea from raw or undercooked beans (PHA) The reports are about red kidney beans, not pinto beans. | Outbreak with undercooked raw kidney beans in chili: 200 cases among 1,700 people (12%); median 3.3 hours to symptoms; reports say symptoms usually start 1 to 3 hours after eating | usually short and self-limited; rarely severe (shock and kidney injury in one child) Recovered with supportive care in the child case report; no antidote exists for PHA | Case report 12 3 16 |
| Gas, bloating and flatulence Half a cup of beans a day for 8 to 12 weeks in adults; a questionnaire, not a gut study. | Under 50% reported more flatulence from pinto or baked beans in the first week of feeding studies, 19% with black-eyed peas, 3 to 11% on control diets | mild to moderate (self-reported) Not stated in the abstract | Controlled trial 14 |
| Allergic reaction to beans, from itching and hives to anaphylaxis General food allergy facts from MedlinePlus; pinto beans are not named. | Not found for pinto beans | can be severe (anaphylaxis) Not found | Authoritative guidance 22 |
Liver
No liver injury from eating pinto beans was found in the sources read. A liver-safety source (such as LiverTox) was not searched for this food page.
How often. No frequency was found.
Monitoring. No agency monitoring advice was found.
This is a safety connection. It is not evidence that Pinto Beans supports liver health.
Medicines and supplements 2
| With | Why it matters | Importance | Evidence | What to do |
|---|---|---|---|---|
| Medicines that raise blood potassium (ACE inhibitors, ARBs, potassium-sparing diuretics) prescription | MedlinePlus says high blood potassium can follow poor kidney function or these medicines, and that people with kidney problems should not eat too many potassium-rich foods. Boiled pinto beans contain potassium (USDA: 436 mg per 100 g). | MedlinePlus does not name beans. The link is our reading of two separate facts. Normal food amounts have not been tested in a trial. | Authoritative guidance Low certainty 23 27 | If you have kidney disease or take one of these medicines, ask a clinician or pharmacist about potassium-rich foods. |
| Other medicines, including warfarin and blood sugar medicines prescription | No interaction was found in the sources read. USDA lists little vitamin K in boiled pinto beans (3.5 micrograms per 100 g). | Absence of evidence is not proof of safety. Pulses may lower blood sugar markers (see Benefits), which matters for people on blood sugar medicine. | None found Not enough evidence 27 9 | If you take medicine for blood sugar, blood pressure or blood thinning, ask your clinic or pharmacist before large changes to your diet. |
Who should check first 6
| Situation | Advice | Evidence |
|---|---|---|
| Known or suspected bean or other legume allergy | Avoid pinto beans until an allergist has advised you. For trouble breathing or swelling of the face or throat, call emergency services. | Authoritative guidance 22 |
| Raw or undercooked dried beans | Do not eat dried beans raw or undercooked. Follow the FDA steps: soak at least 5 hours, then boil in fresh water for at least 30 minutes. Canned beans are already cooked. | Authoritative guidance 16 10 |
| Kidney disease with a potassium or phosphorus limit | Ask your kidney team whether pinto beans fit your limits. MedlinePlus does not name beans. | Authoritative guidance 23 27 |
| Irritable bowel syndrome or a gut that reacts to beans | A dietitian can help you test beans safely. Harvard says soaking dried beans for at least three hours and cooking may help. | Secondary reference 18 14 |
| Pregnancy and breastfeeding | No pinto-specific advice was found. MedlinePlus lists dried beans and peas as natural folate sources and says women thinking about pregnancy should take folic acid supplements because food alone can be hard. Cook dried beans fully. Ask your doctor or midwife. | Authoritative guidance 21 16 |
| Babies and young children | The one severe PHA case we read was an 8-year-old child (red kidney beans), so cook beans fully for children. No source on choking risk or on the right age to introduce pinto beans was read; ask a paediatrician or dietitian. | Case report 3 |
Overdose, product quality and regulators
Summary. Pinto beans cooked fully are an ordinary food. The toxicity concern is the lectin PHA in raw or undercooked beans, documented for red kidney beans.
Animal. Not reviewed.
Human doses studied. Half a cup of pinto beans a day for 8 to 12 weeks in feeding studies; gas was the main complaint reported (trial detail, not advice).
Genotoxicity. Not researched.
Toxic or hazardous parts. Raw or undercooked dried bean seeds contain the lectin PHA. The amount in pinto beans was not found.
Heat-sensitive lectins are the main documented issue. Pesticide residues, heavy metals, mould toxins and can-lining chemicals were not researched.
Lectin PHA and cooking. In a laboratory study, dark red kidney beans held an estimated 223 mg of active lectin per gram dry weight, while commercially cooked canned beans had more than 99% less (4.9 micrograms per gram dry weight). Pinto beans were not tested. 10
Processing and natural antinutrients. A 2026 review says soaking, germination, fermentation and heat reduce phytic acid, tannins, lectins and trypsin inhibitors in legumes, with soaking leaching some minerals into the water. 4
| Body | Action | Date |
|---|---|---|
| FDA (US) (United States) | Natural Toxins in Food: phytohaemagglutinin (PHA) is a lectin in raw or undercooked beans; at high levels in raw beans it can cause nausea, severe vomiting and diarrhea; soak at least 5 hours and boil in fresh water at least 30 minutes; low levels in canned and properly cooked kidney beans do not matter. Pinto beans are not named. source | 2024-09-26 |
| MedlinePlus (US National Library of Medicine) (United States) | Potassium in diet: people with kidney problems, particularly on dialysis, should not eat too many potassium-rich foods; high blood potassium can follow poor kidney function and some blood pressure medicines. source | 2026-04-30 |
| MedlinePlus (US National Library of Medicine) (United States) | Food allergy: symptoms range from itching and hives to anaphylaxis, which is a medical emergency; diagnosis by a health care provider. source | not shown |
When to get medical help
- Trouble breathing, swelling of the lips, face or throat, widespread hives, repeated vomiting or collapse after eating beans (possible anaphylaxis): call emergency services
- Severe vomiting or diarrhoea, dizziness, fainting or confusion in the hours after eating undercooked beans, especially in a child: seek urgent medical care (a child in a case report went into shock)
- An abnormal or dangerous heartbeat in a person with kidney disease or on potassium-raising medicine (MedlinePlus links high blood potassium to dangerous heart rhythms): seek urgent care
Stop using the product and contact a clinician or emergency service. In the US, Poison Control is 1-800-222-1222.
General information only, not medical advice. Ask a clinician or pharmacist before use, especially with medicines, in pregnancy or with a health condition. See the Natural Remedy Safety guide.
Frequently asked questions
What are pinto beans good for?
Do pinto beans lower cholesterol?
Do pinto beans need to be soaked and boiled?
Dried beans must be fully cooked. The FDA says the lectin PHA in raw or undercooked beans can cause nausea, severe vomiting and diarrhea, and advises soaking for at least 5 hours and boiling in fresh water for at least 30 minutes. Pinto beans are not named by the FDA, and the poisonings we read were from red kidney beans.
Are canned pinto beans safe to eat straight from the can?
Do pinto beans cause gas?
Are pinto beans a good source of folate and fibre?
Do beans help with blood sugar?
Pooled trials of pulses found lower fasting glucose and longer-term markers, but results varied a lot, and the one pinto trial found no change in glucose, insulin or HbA1c. In 28 of 40 single-meal studies pulses gave lower after-meal blood sugar than other starches. Beans are not a treatment for diabetes.
Do beans help with weight or blood pressure?
Can you be allergic to pinto beans?
Bean allergy is possible, as with other foods. We did not find a source on how common pinto bean allergy is or on cross-reaction with peanut or soy. For trouble breathing or swelling of the face or throat, call emergency services. Ask an allergist.
Are pinto beans OK with kidney disease?
Are refried pinto beans the same as plain boiled beans?
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Editorial transparency
- Written by
- AlternativeMed editorial team. Research compiled with AI assistance, then checked against the sources listed.
- Medical review
- None. This page has not been reviewed by a physician or pharmacist.
- First published
- 2026-10-26
- Last substantive update
- 2026-10-26
- How we research
- We started from our existing pinto bean summary, re-checked nutrition against USDA FoodData Central data, read the health agency pages (FDA, MedlinePlus) and the Harvard Nutrition Source, and searched PubMed for trials, reviews and safety reports. Only abstracts were read for studies. Items we could not verify are flagged in the research gaps.
- How we rate evidence
- See "How we rate evidence" in the Evidence tab.
- Independence
- No product is promoted on this page. No affiliate links are shown.
Sources 27
Each source was opened and checked. Where we read only the abstract, it says so. The small numbers in the text point here.
- Back S, Yang S, Rossi A, et al.. Effect of Different Types of Whole Dietary Pulses on Established Therapeutic Lipid Targets for Cardiovascular Risk Reduction: An Updated Systematic Review and Dose-Response Meta-Analysis of Randomized Controlled Trials.. J Am Heart Assoc. 2026. PMID 42132198. DOI 10.1161/JAHA.125.046659. (abstract)
- Ha V, Sievenpiper JL, de Souza RJ, et al.. Effect of dietary pulse intake on established therapeutic lipid targets for cardiovascular risk reduction: a systematic review and meta-analysis of randomized controlled trials.. CMAJ. 2014. PMID 24710915. DOI 10.1503/cmaj.131727. (abstract)
- Haile AM, Mengistie BT, Teshager AA, et al.. Severe red kidney beans toxicity in an 8-year-old girl: a rare case of hypovolemic shock and prerenal acute kidney injury.. Int J Emerg Med. 2026. PMID 41714947. DOI 10.1186/s12245-026-01141-0. (abstract)
- Janahar JJ, Balasubramaniam H, Zhang Y.. Nutritional and Functional Attributes of Legumes: A Review of Processing Methods and Their Impacts.. J Food Sci. 2026. PMID 42494153. DOI 10.1111/1750-3841.71318. (abstract)
- Kim SJ, de Souza RJ, Choo VL, et al.. Effects of dietary pulse consumption on body weight: a systematic review and meta-analysis of randomized controlled trials.. Am J Clin Nutr. 2016. PMID 27030531. DOI 10.3945/ajcn.115.124677. (abstract)
- Metoudi M, Sadler I, Kassam S, et al.. Legume and soy consumption and the risk of hypertension: a systematic review and dose-response meta-analysis of prospective studies.. BMJ Nutr Prev Health. 2026. PMID 42539997. DOI 10.1136/bmjnph-2025-001449. (abstract)
- Reyneke GL, Beck EJ, Lambert K, et al.. The Effect of Non-Oil Seed Legume Intake on Blood Pressure: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.. Adv Nutr. 2023. PMID 37031751. DOI 10.1016/j.advnut.2023.04.002. (abstract)
- Schiemann TB, Diekmann C, Egert S.. Acute Effects of Non-Oil-Seed Pulses on Parameters of Cardiometabolic Health: A Systematic Review of Human Intervention Studies.. Nutr Rev. 2026. PMID 41317035. DOI 10.1093/nutrit/nuaf190. (abstract)
- Sievenpiper JL, Kendall CW, Esfahani A, et al.. Effect of non-oil-seed pulses on glycaemic control: a systematic review and meta-analysis of randomised controlled experimental trials in people with and without diabetes.. Diabetologia. 2009. PMID 19526214. DOI 10.1007/s00125-009-1395-7. (abstract)
- Thompson HJ, Neil ES, McGinley JN, et al.. Toward Standardized Measurement of Active Phytohemagglutinin in Common Bean, Phaseolus vulgaris, L.. Foods. 2025. PMID 41464957. DOI 10.3390/foods14244247. (abstract)
- Viguiliouk E, Glenn AJ, Nishi SK, et al.. Associations between Dietary Pulses Alone or with Other Legumes and Cardiometabolic Disease Outcomes: An Umbrella Review and Updated Systematic Review and Meta-analysis of Prospective Cohort Studies.. Adv Nutr. 2019. PMID 31728500. DOI 10.1093/advances/nmz113. (abstract)
- Watier-Grillot S, Larréché S, Mazuet C, et al.. From Foodborne Disease Outbreak (FBDO) to Investigation: The Plant Toxin Trap, Brittany, France, 2018.. Toxins (Basel). 2023. PMID 37505726. DOI 10.3390/toxins15070457. (abstract)
- Winham DM, Hutchins AM, Johnston CS.. Pinto bean consumption reduces biomarkers for heart disease risk.. J Am Coll Nutr. 2007. PMID 17634169. DOI 10.1080/07315724.2007.10719607. (abstract)
- Winham DM, Hutchins AM.. Perceptions of flatulence from bean consumption among adults in 3 feeding studies.. Nutr J. 2011. PMID 22104320. DOI 10.1186/1475-2891-10-128. (abstract)
- Zargarzadeh N, Mousavi SM, Santos HO, et al.. Legume Consumption and Risk of All-Cause and Cause-Specific Mortality: A Systematic Review and Dose-Response Meta-Analysis of Prospective Studies.. Adv Nutr. 2023. PMID 36811595. DOI 10.1016/j.advnut.2022.10.009. (abstract)
- . FDA: Natural Toxins in Food. . . (full-text)
- . GBIF species match: Phaseolus vulgaris L.. . . (api)
- . Harvard T.H. Chan School of Public Health: The Nutrition Source, Legumes. . . (full-text)
- . Health Canada: Lectins in Dry Legumes. . . (summary-only)
- . MedlinePlus: Fiber. . . (full-text)
- . MedlinePlus: Folic acid in the diet. . . (full-text)
- . MedlinePlus: Food allergy. . . (full-text)
- . MedlinePlus: Potassium in diet. . . (full-text)
- . PubChem: Folic acid (CID 135398658). . . (api)
- . PubChem: Phytate / phytic acid (CID 890). . . (api)
- . USDA FoodData Central: Beans, pinto, mature seeds, raw (FDC 175199). . . (saved-copy)
- . USDA FoodData Central: Beans, pinto, mature seeds, cooked, boiled, without salt (SR Legacy, FDC 175200). . . (saved-copy)
Where to buy
Check the label first. Whatever you buy, look for these:
- A recent packed-on date: very old dried beans cook unevenly
- Organic or not, and the country of origin
- Whether you want dried or canned
- Soak and cook thoroughly; some raw beans are unsafe
Talk to a pharmacist or doctor before you start any supplement, especially if you take medicines. See the Safety tab for interactions.
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