Buckwheat: Nutrients, What Research Shows and Safety
Buckwheat as a food: USDA nutrient values, what trials found on blood sugar and cholesterol, why it is gluten-free, buckwheat allergy and fagopyrin.
Content last updated . This page has not been medically reviewed.
Buckwheat is the seed of Fagopyrum esculentum. Despite the name, it is not a type of wheat. It is cooked and eaten like a grain and is called a pseudocereal. [1] The seeds are sold as groats; roasted groats are also called kasha. [2] People eat buckwheat for fiber, minerals and because it is naturally gluten-free. This page keeps the whole food apart from extracts, tea and supplements, and apart from hype.
Read this first
- Naturally gluten-free. FDA names buckwheat among grains other than wheat, rye, barley and their hybrids that can carry a "gluten-free" label, if gluten from cross-contact stays under 20 ppm. [3] The Celiac Disease Foundation lists buckwheat groats as gluten-free and advises against bulk bins. [2]
- Buckwheat allergy is real and can be severe. In a 2026 hospital series of 46 patients in China, 45 had immediate reactions after eating buckwheat and 33 had anaphylaxis. [4] For trouble breathing or swelling of the face or throat, call 911 (or your local emergency number). [5]
- Evidence in one line: pooled trials suggest modest drops in blood glucose, total cholesterol and triglycerides, but the results vary a lot between studies and a 148-person trial found no difference from rice or bulgur. [6] [1]
- Buckwheat and other medicines or conditions: we did not read a source on buckwheat and medicine interactions.
What is in it (USDA values)
The values below are for roasted buckwheat groats, cooked (USDA FoodData Central item 170686, SR Legacy). [7] The serving column is the USDA household portion, 1 cup cooked, which USDA lists as 168 g. [7]
| Nutrient | Per 100 g | Per 1 cup cooked (168 g) | % Daily Value per serving |
|---|---|---|---|
| Energy | 92 kcal | 155 kcal | not set |
| Total fat | 0.62 g | 1.0 g | 1% |
| Saturated fat | 0.13 g | 0.2 g | 1% |
| Protein | 3.38 g | 5.7 g | 11% |
| Fiber | 2.7 g | 4.5 g | 16% |
| Magnesium | 51 mg | 86 mg | 20% |
| Manganese | 0.403 mg | 0.68 mg | 29% |
| Copper | 0.146 mg | 0.25 mg | 27% |
| Phosphorus | 70 mg | 118 mg | 9% |
| Zinc | 0.61 mg | 1.0 mg | 9% |
| Iron | 0.8 mg | 1.3 mg | 7% |
| Niacin (B3) | 0.94 mg | 1.6 mg | 10% |
| Potassium | 88 mg | 148 mg | 3% |
| Folate (DFE) | 14 mcg | 24 mcg | 6% |
% Daily Value uses the FDA 2016 Daily Values; values vary with variety, roasting and how much water is absorbed in cooking. The serving figures are the 100 g values multiplied by 1.68. USDA lists raw buckwheat (item 170286) at 343 kcal, 13.3 g protein and 10.0 g fiber per 100 g, so the cooked values per 100 g are lower because of the water. [8] USDA lists no vitamin B12 or vitamin C in buckwheat. [7]
Plant compounds: buckwheat contains rutin, a flavonoid, and fagopyrin F, which a 2026 study calls a photosensitizer. [9] A systematic review of 154 studies found that buckwheat has more flavonoids, rutin, plant sterols and tocols than oats; it noted that most of the studies were old and used different methods. [10] This is chemistry from the lab, not proof of a benefit in people.
What research says
| Health goal | What the sources found | Strength of evidence | What was studied |
|---|---|---|---|
| Blood glucose, cholesterol, triglycerides | A pooled analysis of 13 human trials (plus animal studies) found lower blood glucose (about 0.85 mmol/L), total cholesterol (about 0.5 mmol/L) and triglycerides (about 0.25 mmol/L) than control groups. All results had high unexplained differences between studies. It stayed unclear whether weight, blood pressure, insulin or LDL cholesterol change. [6] | Promising but limited | Buckwheat foods in adults; many different products and amounts |
| Head-to-head with other grains | In 148 adults with overweight or obesity eating 40 g a day for 4 weeks, changes did not differ significantly between buckwheat, quinoa, rice and bulgur. Within the buckwheat group, blood pressure, blood fats and body fat changed, but that is not proof of a difference from the others. [1] | Mixed | Buckwheat 40 g a day, 4 weeks |
| Fullness and gut bacteria | In a crossover study of 20 healthy volunteers, a 7-day buckwheat-based diet was as filling as their usual diet. [11] A systematic review of 32 studies found only one randomized trial in people; most findings came from cell and animal studies. [12] | Insufficient evidence | 7-day diets; lab and animal work |
| Digestive health | The systematic review says animal and lab studies suggest possible benefit, but human evidence is limited. [12] | Lab or animal only | Mostly animals and cell cultures |
| Whole grains in general and long-term health | A pooled analysis of 45 prospective studies found that people who ate more whole grains had lower risk of heart disease and death. [13] Observational studies cannot prove cause, and buckwheat was not analyzed on its own. | Promising but limited (observational, not buckwheat-specific) | Whole grain intake in general |
| Heart attacks, strokes, diabetes onset | Proper evidence not found in the sources we read. | No good evidence of benefit found | Not applicable |
We did not check funding in every study; abstracts often do not say. Most trials used buckwheat foods or flours. Rutin and other extracts are a separate product, and we read no human trial of them in this review set.
Eaten as food vs taken as tea, extract or supplement. Buckwheat tea and extracts are different products; see buckwheat tea.
How much is a normal serving
The USDA household portion for cooked roasted buckwheat groats is 1 cup (168 g), which has about 155 kcal; for raw buckwheat it is 1 cup (170 g). [7] [8] That is information from the USDA data, not a prescription. Harvard's Nutrition Source lists buckwheat among the unprocessed whole grains. [14] The NHS advises wholegrain starchy foods as a fiber source, without naming buckwheat. [15] The 2026 trial used 40 g a day. [1]
Safety, allergy and medicines
- Buckwheat allergy: in the 46-patient series, 97.8% had immediate reactions, 73.3% had anaphylaxis, and 37.0% had breathing symptoms when exposed to buckwheat husks. [4] A 2025 review notes buckwheat anaphylaxis as an expanding problem. [16] Anaphylaxis is a medical emergency; call 911. [5] See food allergy basics and emergency signs.
- Celiac disease and gluten: buckwheat is naturally gluten-free. [2] [3] NIDDK says flours made from buckwheat are safe on a gluten-free diet. [17] Cross-contact can occur in growing, processing and cooking, so look for a gluten-free label. [17] [3]
- Fagopyrin F: buckwheat contains fagopyrin F, which a 2026 study calls a photosensitizer. All seven household cooking methods tested lowered it, and the largest drops came with pan roasting, oven heating at 200 C, deep frying and air frying. [9] We did not read a report of skin problems from eating cooked groats.
- Diabetes and medicines: the blood sugar results are for markers in trials. We read no source on interactions between buckwheat and diabetes medicines. Ask your care team before changing how you eat or take medicines. See foods and medicine interactions.
- Kidney disease, pregnancy, children: we did not read a source on buckwheat for these groups. See foods in pregnancy and foods and kidney disease.
Choosing, storing and food safety
- For gluten-free diets, choose packages labeled gluten-free and avoid bulk bins. [2]
- Roasted groats (kasha) and raw groats have different USDA values, so check which form a recipe means. [7] [8]
- We did not read a source with specific storage advice for buckwheat. See food storage, leftovers and food safety basics.
Related pages
Health connections for Buckwheat
What research links to eating or drinking this food, and how strong the evidence is. Many studies are observational or use juice, powder, oil or extracts rather than the food as eaten; each card says which.
Buckwheat and blood sugar, cholesterol and triglycerides
Preliminary or mixedA pooled analysis of 13 human trials found lower blood glucose, total cholesterol and triglycerides than in control groups, with high differences between studies.
Supplements: Buckwheat foods in different amounts; results vary and a later head-to-head trial found no difference from rice or bulgur.
Buckwheat compared with quinoa, rice and bulgur
Preliminary or mixedIn 148 adults eating 40 g a day for 4 weeks, changes did not differ significantly between groups.
Supplements: Single 4-week trial.
Buckwheat and digestive health
Lab or animal research onlyA systematic review of 32 studies found one human randomized trial; animal and lab studies suggest possible gut benefits.
Supplements: Human evidence is limited.
Buckwheat and fullness
Not enough evidenceA 7-day buckwheat diet was as filling as the usual diet in 20 healthy volunteers.
Supplements: Very small, short.
Rutin and fagopyrin F in buckwheat
Lab or animal research onlyBuckwheat contains rutin (a flavonoid) and fagopyrin F (a photosensitizer). Cooking lowered fagopyrin F in all seven methods tested.
Supplements: No human outcome read.
Whole grains and long-term health (not buckwheat-specific)
Preliminary or mixedA pooled analysis of 45 observational studies linked more whole grains to lower risk of heart disease and death. This cannot prove cause and does not isolate buckwheat.
Supplements: Information about whole grains in general.
Fiber and minerals in a serving
Established roleOne cup of cooked roasted groats gives about 4.5 g fiber, 5.7 g protein, 29% DV manganese, 27% copper and 20% magnesium by USDA data.
Supplements: Dietary role only.
Connected topics
Open a group to see how each topic connects and how strong the evidence is.
Health goals (2)
- Blood Sugar BalancePreliminary or mixed
A pooled analysis of 13 human trials found lower blood glucose; results varied and a later trial found no difference from rice or bulgur.
- Cholesterol BalancePreliminary or mixed
Total cholesterol and triglycerides were lower in a pooled analysis; LDL effects stayed unclear.
Body systems (2)
- Immune SystemDocumented risk
Buckwheat can trigger severe allergic reactions including anaphylaxis in allergic people.
- Blood Sugar SupportPreliminary or mixed
Lower blood glucose in a pooled analysis.
Functional actions (1)
- Blood Sugar RegulationPreliminary or mixed
Lower blood glucose in a pooled analysis; variable results.
Root causes (1)
- Blood Sugar ImbalancePreliminary or mixed
Lower glucose in a pooled analysis.
Habits (1)
- Balanced NutritionPreliminary or mixed
A whole-grain choice; observational data link more whole grains to lower risk, not buckwheat-specific.
Biomarkers (2)
- Blood GlucosePreliminary or mixed
About 0.85 mmol/L lower than controls in a pooled analysis, with high differences between studies.
- TriglyceridesPreliminary or mixed
About 0.25 mmol/L lower in a pooled analysis.
Conditions & symptoms (3)
- AnaphylaxisDocumented risk
Anaphylaxis occurred in 33 of 46 buckwheat-allergic patients; call 911 for trouble breathing or swelling of the face or throat.
- Celiac DiseaseDocumented risk
Buckwheat is naturally gluten-free, but cross-contact can occur; choose labeled products (under 20 ppm).
- Food AllergyDocumented risk
Buckwheat allergy can be severe; in a 46-patient series, 45 had immediate reactions.
Documented risks and interactions (2)
- Buckwheat allergy and anaphylaxis. In a 2026 series of 46 patients, 45 had immediate reactions and 33 had anaphylaxis; 17 had breathing symptoms on exposure to husks. Call 911 for trouble breathing or swelling of the face or throat.
- Naturally gluten-free grain and cross-contact. Buckwheat is not wheat and is naturally gluten-free; it can pick up gluten in processing. A US gluten-free label means under 20 ppm.
Frequently asked questions
Is buckwheat related to wheat?
No. Buckwheat is the seed of Fagopyrum esculentum and is not a wheat. FDA names it among naturally gluten-free grains for labeling. [3]
Is buckwheat gluten-free?
Yes, it is naturally gluten-free. [2] Look for a gluten-free label if you have celiac disease, because of cross-contact. [17] [3]
Can you be allergic to buckwheat?
Yes. A 2026 series of 46 buckwheat-allergic patients found anaphylaxis in 33. [4] Call 911 for trouble breathing or swelling of the face or throat. [5]
Does buckwheat lower blood sugar or cholesterol?
A pooled analysis found modest drops in blood glucose, total cholesterol and triglycerides, with large differences between studies. [6] A later 148-person trial found no significant difference from rice or bulgur. [1]
What is kasha?
Kasha is the name for roasted buckwheat groats. [2] USDA lists roasted and raw groats separately. [7] [8]
References
- Oztekin Y et al. Metabolites. Comparative effects of quinoa, buckwheat, bulgur, and rice on cardiometabolic health in adults with overweight or obesity: a randomized controlled study. 2026. (abstract read via Europe PMC) Read 2026-10-24.
- Celiac Disease Foundation. Gluten-free foods. Read 2026-10-24.
- FDA. Questions and Answers: Gluten-Free Food Labeling Final Rule. 2022. (content current as of 2022-06-30) Read 2026-10-24.
- Bian S et al. Clinical characteristics and IgE-binding protein profiles of patients with buckwheat allergy in China. 2026. (abstract read via Europe PMC) Read 2026-10-24.
- MedlinePlus. Food allergy. Read 2026-10-24.
- Li L, Lietz G, Seal C. Buckwheat and CVD risk markers: a systematic review and meta-analysis. 2018. (abstract read via Europe PMC) Read 2026-10-24.
- U.S. Department of Agriculture. FoodData Central: Buckwheat groats, roasted, cooked (SR Legacy, FDC 170686). April 2018 release. Read 2026-10-24.
- U.S. Department of Agriculture. FoodData Central: Buckwheat (SR Legacy, FDC 170286). April 2018 release. Read 2026-10-24.
- Kim J et al. Effects of household processing on rutin and fagopyrin F in common and Tartary buckwheat. 2026. (abstract read via Europe PMC) Read 2026-10-24.
- Raguindin PF et al. A systematic review of phytochemicals in oat and buckwheat. 2021. (abstract read via Europe PMC) Read 2026-10-24.
- Neacsu M et al. Fava bean and buckwheat are sustainable food sources which support satiety and beneficially modulate several biomarkers, bacteria and metabolites associated with human health. 2025. (abstract read via Europe PMC) Read 2026-10-24.
- Valido E et al. Systematic review of human and animal evidence on the role of buckwheat consumption on gastrointestinal health. 2022. (abstract read via Europe PMC) Read 2026-10-24.
- Aune D et al. BMJ. Whole grain consumption and risk of cardiovascular disease, cancer, and all cause and cause specific mortality: systematic review and dose-response meta-analysis of prospective studies. 2016. (abstract read via Europe PMC) Read 2026-10-24.
- Harvard T.H. Chan School of Public Health. Whole grains (The Nutrition Source). Read 2026-10-24.
- NHS. Starchy foods and carbohydrates. Read 2026-10-24.
- Leung AS et al. Global trend of food-induced anaphylaxis: up to date. 2025. (abstract read via Europe PMC) Read 2026-10-24.
- NIDDK. Eating, diet and nutrition for celiac disease. Read 2026-10-24.