Healthy Weight & Metabolism
Lose Weight Sustainably
Losing weight in a way you can live with usually means small, steady changes to eating, movement and sleep rather than a fast fix, and a modest loss of 5 to 10% of body weight can already improve health. This guide shows what trials and health agencies support, what to be wary of, and when to bring in a clinician or dietitian.
General information, not medical advice. Last updated October 31, 2026. Written by the AlternativeMed editorial team. Not medically reviewed.
Start here
- Book a quick conversation with your doctor, nurse or a registered dietitian first, especially if you take regular medicines, have diabetes or other conditions, are pregnant or breastfeeding, or have ever had an eating disorder. They can also check whether a medicine or health problem is affecting your weight.
- Aim for a modest first target, such as 5 to 10% of your starting weight over about 6 months, and choose one or two changes you could keep for years: a little less energy from food and drink, more everyday movement, and enough sleep.
- Pick support that lasts: a group, coach, dietitian or app that checks in with you, rather than a plan with a start and end date.
Be careful with
- Skip crash diets, very low calorie plans without professional supervision, fat burners, laxatives and "detox" products. They are not a safe shortcut, and some contain hidden drugs or have been linked to liver injury.
- If food rules feel rigid or frightening, or you are skipping meals, bingeing, purging or exercising compulsively to control weight, pause and talk to a professional. Weight loss is not the right goal for everyone; see Eating Disorders and Disordered Eating.
- Never change or stop diabetes, blood pressure or other prescribed medicines on your own. Weight loss can change how much medicine you need, and that adjustment belongs with your clinician.
Get help when
- You are losing weight without trying, or you have gained weight quickly without a clear reason (for example swelling in the legs or tummy, or a change after starting a new medicine). Both need a medical check.
- You have diabetes, heart disease, kidney or liver disease, or take regular medicines, and want to cut back on food or increase exercise a lot.
- You feel faint, dizzy, very weak, or have chest pain, a racing or irregular heartbeat or shortness of breath with exercise. Get urgent care.
- Eating, weighing or exercise has started to feel out of control, secretive or frightening (restricting, bingeing, purging, fear of eating). Ask a doctor or an eating-disorder service for help. If you are in the US and in crisis, call or text 988.
- You are under 18, pregnant, breastfeeding, or over 65 and want to lose weight on purpose. Loss in these groups should be guided by a clinician.
About Lose Weight Sustainably
What this goal means
Losing weight sustainably means reducing body fat gradually, in a way you can keep up for the long term, without extreme restriction or products that put your health at risk. The aim is not the fastest possible number on the scale but a change in habits that lasts and that improves how you feel and your health markers.
NHS guidance for adults living with overweight says that losing even 5 to 10% of body weight can improve health, and suggests aiming for steady loss of about 0.5 to 1 kg (1 to 2 lb) a week while being kind to yourself, because changing habits takes time. NIDDK, the US National Institute of Diabetes and Digestive and Kidney Diseases, says experts recommend an initial goal of 5% to 10% of starting weight within 6 months.
This page is about losing weight on purpose, for adults who have discussed it with a professional or who are starting with general information. It gives no calorie targets, because needs differ with age, size, activity, health conditions and life stage.
1,2What people commonly experience
Many people lose weight fairly quickly in the first months and then find progress slows or reverses. In a 2-year trial of 811 adults with overweight, participants in each diet group had lost an average of about 6 kg (around 7% of starting weight) at 6 months and began to regain weight after 12 months; by 2 years the average loss among those who completed the trial was 4 kg. This pattern is common and is not a personal failure.
After weight loss, hunger can rise and the body may use less energy than expected for its new size, which makes regain more likely. A review describes lower levels of the hormone leptin, a lower resting metabolic rate and a higher drive to eat after weight loss. This is why support and plans for keeping weight off matter as much as the starting plan.
3,4Factors that shape weight loss
NIDDK lists habits, sleep, medicines, health conditions, genes and the places where people live, work and play among the factors that affect weight and the ability to lose it. A clinician can review medicines and dietary supplements you take to see whether they may be affecting your weight.
Sleep and mood matter too: NHS says not getting enough sleep can make it harder to lose weight, because poor sleep may make you more likely to choose high-calorie foods and too tired to exercise or cook. Some medicines and conditions can raise weight or make loss harder; see Medicines That Can Change Weight and Why Weight Changes.
2,5Conditions worth knowing about
NHS says to see a GP if your BMI is in the overweight or obese range and you want help losing weight, your waist is more than half your height, or you have pre-diabetes, diabetes, high blood pressure, joint pain, high cholesterol, sleep apnoea or heart disease. It also lists a possible eating disorder such as binge eating as a reason to seek help.
For context on overweight and obesity as health conditions, weight stigma and medical care, see Overweight and Obesity: Health Context and Care Options. If blood sugar is a concern, see Prediabetes, Type 2 Diabetes and Metabolic Syndrome.
1Realistic expectations
Most people lose a modest amount, and many regain some. In the 2-year trial above, 14 to 15% of participants had lost at least 10% of their starting weight. Attendance at group sessions was strongly associated with weight loss (about 0.2 kg for each session attended), which points to the value of ongoing support.
BMI and scale weight are only part of the picture. NHS suggests also tracking waist size relative to height and says BMI cannot tell muscle from fat. Strength, energy, sleep, blood pressure and blood tests are other signs of progress; see BMI, Body Composition and Muscle.
3,1Who this applies to
This guide is written for adults who want to lose excess weight. It is not appropriate as a self-guided plan for children and teenagers, pregnant or breastfeeding people, anyone with a current or past eating disorder, or people who are underweight or losing weight without trying. These groups need individual guidance from a clinician.
If you take medicines for diabetes or blood pressure, plan changes with your prescriber. In the DiRECT trial, such medicines were withdrawn as part of a clinician-led programme in primary care, not by participants alone.
6Related conditions and symptoms
Overweight and Obesity: Health Context and Care Options → Prediabetes, Type 2 Diabetes and Metabolic Syndrome → Eating Disorders and Disordered Eating → Unintentional Weight Loss: Why It Matters →
A manageable starting plan
An educational starting point, not a personal prescription. Adjust it to your own situation and any advice from your clinician.
Your first actions
- Week 1: speak to your doctor or a dietitian if you have any health condition or take medicines. Write down your starting weight, waist and what you would like to feel better doing.
- Weeks 1 to 4: choose two eating changes you could keep (for example, fewer sugary drinks and a vegetable or beans at lunch and dinner) and start walking for about 10 minutes a day, adding a few minutes each week.
- Throughout: protect sleep, and note how you feel each week in a simple log.
- Month 2 onwards: build toward about 150 minutes a week of moderate activity, add two short strength sessions, and set up regular support (group, coach or dietitian).
Optional additions
- Weigh yourself once a week at the same time and look at the trend over several weeks.
- Try a Mediterranean-style pattern if it appeals to you.
- Add more fibre-rich foods gradually.
- Ask your clinician whether a structured programme or other medical options are suitable.
What to track
- Waist measurement and how your clothes fit.
- Energy, mood, sleep and strength or stamina.
- Blood pressure, blood sugar or cholesterol if your clinician is monitoring them.
- How easy the changes feel to keep up.
When to reassess
Review after 4 to 6 weeks. A steady loss of about 0.5 to 1 kg a week is what NHS suggests, but progress is rarely smooth. If you have not lost weight after several weeks of consistent habits, or you are losing more than expected, or you feel unwell, speak to your clinician rather than cutting food further. Stalling is common; see Understand Weight-Loss Plateaus.
When to seek professional support
- Your doctor, practice nurse or a registered dietitian.
- A group programme or coach, or a friend to walk with.
- For worries about eating, weight or body image: your doctor, or an eating-disorder service such as Beat in the UK. In the US, call or text 988 in a crisis.
What helps
Ordered by how well the research supports each step. Evidence strength is shown on every card; precautions sit next to the advice.
Start here
A realistic first target and a plan for keeping it
High certaintyAddresses: Sets a goal you can reach and keep, rather than a quick drop that rebounds
Why it may help: NIDDK says experts recommend an initial goal of 5% to 10% of starting weight within 6 months, and that successful programmes include a plan for keeping the weight off. NHS says even 5 to 10% can improve health.
How to apply it: Write down your start weight and the 5 to 10% mark. Treat it as a first milestone, not a finish line. Add a note for what you will keep doing afterwards, such as the same movement routine and meals you enjoy.
Who it may suit: Most adults living with overweight who want to lose weight.
Precautions: Not suitable as a self-guided goal if you are under 18, pregnant, breastfeeding, underweight, or have an eating-disorder history. Ask your clinician about a target that fits your health.
2,1A modest, steady cut in the energy you take in, using foods you can keep eating
High certaintyAddresses: Weight loss by a small, sustained gap between food energy in and energy used
Why it may help: NHS explains that weight tends to rise if you eat and drink more calories than you use and to fall if you eat and drink fewer. A 2-year trial of 811 adults found reduced-calorie diets gave clinically meaningful weight loss whichever mix of fat, protein and carbohydrate they emphasised. NHS suggests steady loss of about 0.5 to 1 kg a week.
How to apply it: Start with changes you would still be happy with in a year: smaller portions of energy-dense foods, fewer sugary drinks and less alcohol, more vegetables, fruit, beans and whole grains. Read nutrition labels and plan meals ahead. A registered dietitian can set amounts that suit your body and health.
Who it may suit: Adults without medical reasons to avoid weight loss.
Precautions: Do not cut food to very low levels without professional supervision. People with diabetes, kidney disease, pregnancy or breastfeeding, older adults, and anyone with an eating-disorder history need clinician guidance first.
7,3,1Regular movement, building toward 150 minutes a week
Moderate certaintyAddresses: Smaller waist, less body fat and better fitness, with a modest effect on scale weight
Why it may help: A meta-analysis of 116 randomised trials (6,880 adults with overweight or obesity) found each 30 minutes a week of aerobic exercise was associated with 0.52 kg lower body weight and 0.56 cm smaller waist, and 150 minutes a week at moderate to vigorous intensity gave clinically important drops in waist size and body fat. NHS says moving more can help you keep weight off and brings other benefits even if you start with 10 minutes at a time.
How to apply it: Begin with a daily walk and add minutes slowly. Add two days of muscle-strengthening work when you can; see Preserve Muscle While Losing Weight.
Who it may suit: Most adults; start gently if you have been inactive.
Precautions: See a doctor first if you have heart disease, chest pain, joint problems, are pregnant, or have not exercised for a long time. Stop and get care for chest pain, fainting or severe breathlessness. In the meta-analysis, exercise was associated with slightly more mild-to-moderate adverse events, mostly muscle and joint complaints.
8,5Keeping a simple record of food, movement or weight
Low certaintyAddresses: Greater awareness of eating and activity habits, linked with more weight loss
Why it may help: A systematic review of 22 studies found a consistent association between self-monitoring (diet, exercise and self-weighing) and weight loss, but rated the evidence as weak because of methodological limits. NIDDK lists monitoring your weight at least once a week among strategies that may help prevent regain, and daily food and activity tracking among features of safe programmes.
How to apply it: Choose the simplest method you will actually use: a paper notebook, a notes app or a photo of meals. Weigh at the same time of day, for example weekly, and look at the trend rather than one reading.
Who it may suit: People who like numbers and routines.
Precautions: Counting, weighing or logging can fuel anxiety or obsessive habits in some people, especially with an eating-disorder history. Stop and seek support if tracking becomes distressing.
9,2Ongoing support: a group, coach, dietitian or structured programme
Moderate certaintyAddresses: Better adherence and more weight lost over time
Why it may help: NIDDK describes safe programmes as giving ongoing guidance and support, and NHS lists one-to-one coaching, group support, cognitive behavioural therapy and online classes as weight-management options. In the 2-year trial, attendance at group sessions was strongly associated with weight loss.
How to apply it: Ask your GP or clinician about local weight-management services, or a referral to a registered dietitian. In the UK some programmes allow self-referral.
Who it may suit: Anyone who has lost weight before and regained it, or who finds it hard to go alone.
Precautions: Check any programme against the warning signs in the What to Avoid tab. Ask whether its methods have been studied in people and published in a scientific journal.
2,1,3Additional options
Getting enough sleep
Low certaintyAddresses: Possibly lower daily energy intake
Why it may help: In a randomised trial of 80 adults aged 21 to 40 with overweight who usually slept under 6.5 hours, counselling that extended sleep by about 1.2 hours a night lowered energy intake by about 270 kcal a day compared with controls. NHS also says poor sleep can make weight loss harder.
How to apply it: Keep a regular bedtime and wake time and protect time for sleep. See the sleep goal pages for practical help.
Who it may suit: People who regularly sleep less than they need.
Precautions: This is a single, small trial in younger adults, so results may not apply to everyone. Persistent sleep trouble, loud snoring or pauses in breathing need a medical check.
10,5How to Fall Asleep Faster → Sleep, Stress and the Food Environment →
Fewer ultra-processed foods and more minimally processed meals
Low certaintyAddresses: Lower food intake without trying, in a short controlled trial
Why it may help: In an inpatient NIH trial of 20 adults, eating an ultra-processed diet for 2 weeks led to greater energy intake and weight gain than eating an unprocessed diet for 2 weeks, even though meals were matched for presented calories, sugar, fibre and macronutrients.
How to apply it: Cook more meals from whole ingredients where you can, and keep ready-to-eat snacks such as fruit, nuts or yogurt visible.
Who it may suit: Anyone eating many packaged or fast foods.
Precautions: The trial was small and short and took place in a hospital setting, so it shows plausibility rather than a long-term weight-loss method. Good-quality convenience foods can still fit a plan.
11A Mediterranean-style pattern combined with activity
Low certaintyAddresses: Less body fat and preserved lean mass in older adults with metabolic syndrome
Why it may help: In the PREDIMED-Plus trial, adults aged 55 to 75 with overweight or obesity and metabolic syndrome who followed an energy-reduced Mediterranean diet plus more physical activity had greater reductions in total and visceral fat and less loss of lean mass than those given usual-care advice.
How to apply it: Build meals around vegetables, fruit, beans, whole grains, fish, nuts and olive oil. Combine with regular walking and strength work.
Who it may suit: People who enjoy this style of eating and want a pattern with other health benefits.
Precautions: Findings come from an interim subgroup analysis in a specific older group, and the benefit was for diet plus activity together. Nuts and fish are allergens for some people.
12Fibre-rich foods, including gel-forming (viscous) fibre
Low certaintyAddresses: A small additional weight benefit and fuller feeling
Why it may help: A meta-analysis of 62 trials (3,877 people) found added viscous fibre reduced body weight by 0.33 kg and waist circumference by 0.63 cm when people ate freely, with greater reductions in people with overweight, diabetes and metabolic syndrome.
How to apply it: Include oats, beans, lentils, fruit and vegetables regularly. Increase fibre gradually and drink fluids with it.
Who it may suit: Most adults.
Precautions: The effect is small. Too much fibre too quickly can cause bloating and gas. Fibre supplements can affect how some medicines are absorbed, so ask a pharmacist.
13Weight-Loss Supplements, Fat Burners, Detox Teas and Vinegar: Claim Check →
Still being studied
Intermittent fasting
Low certaintyAddresses: Similar weight loss to regular dietary advice in current trials
Why it may help: A 2026 Cochrane review found that, compared with regular dietary advice, intermittent fasting may result in little to no difference in weight loss, with low-certainty evidence, and may have little to no effect on quality of life.
How to apply it: If you choose it, treat it as one way to reduce overall intake, not a special metabolic trick. Check with a clinician first.
Who it may suit: People who find fixed eating windows easier than counting portions.
Precautions: Not suitable for people with diabetes on glucose-lowering medicines, pregnancy or breastfeeding, under 18, older frail adults, or anyone with an eating-disorder history without clinician supervision. Long-term data are limited.
14Low-carbohydrate and ketogenic patterns
Mixed findingsAddresses: Similar weight loss to low-fat diets at 6 months; small long-term difference
Why it may help: A network meta-analysis of 121 trials with 21,942 adults found low-carbohydrate and low-fat diets had a similar effect on weight at 6 months (4.63 kg versus 4.37 kg compared with usual diet). A separate meta-analysis of long-term trials found a small difference in favour of low-carbohydrate diets compared with low-fat diets.
How to apply it: If you try it, keep vegetables, fibre and healthy fats in the plan and review cholesterol with your doctor.
Who it may suit: People who find this pattern easier to stick to and have no medical reason to avoid it.
Precautions: Not suitable without medical supervision for people with diabetes treated with insulin or certain tablets, kidney disease, pregnancy or breastfeeding, or an eating-disorder history. Very low carbohydrate diets can raise LDL cholesterol in some people.
15,16Higher-protein eating during weight loss
Mixed findingsAddresses: May help hold on to lean mass and fullness in the short term
Why it may help: A review reported that higher-protein, energy-restricted diets produced greater short-term fat loss and preserved lean mass, but that longer-term studies were limited and conflicting. In the 2-year trial, diets with 15% and 25% protein produced similar weight loss.
How to apply it: Include a protein source at each meal and pair with strength training.
Who it may suit: Adults who are also doing resistance exercise.
Precautions: People with kidney disease should check with their clinician before raising protein intake. Protein powders vary in quality.
17,3Food & nutrition
Choosing an eating pattern you can keep
No single eating pattern has been shown to be best. In a 2-year trial of 811 adults, reduced-calorie diets gave clinically meaningful weight loss regardless of which macronutrients they emphasised. NHS describes a balanced diet as including fruit and vegetables, starchy foods, protein and unsaturated fats.
NIDDK says the best plan is one backed by science and tailored to your health, culture, preferences and values so you can stick with it. Our Eating Patterns Compared page sets out Mediterranean, low-carbohydrate, low-fat, intermittent-fasting and other patterns side by side.
- Build plates around vegetables, fruit, beans and lentils, whole grains, fish or other protein, nuts and olive oil.
- Keep some foods you love in the plan, in smaller or less frequent portions.
- Plan meals and shopping; look at nutrition labels for energy and portion size.
Filling foods: fibre and minimally processed meals
A meta-analysis of 62 trials found that gel-forming (viscous) fibre modestly reduced body weight (0.33 kg) and waist (0.63 cm) without calorie restriction. In a short inpatient trial, adults ate less and lost weight on an unprocessed diet compared with an ultra-processed diet.
Oats, beans, lentils, fruit and vegetables are familiar fibre-rich foods. Increase them gradually and drink enough fluid.
- Start the day with oats, eggs or yogurt and fruit rather than a sugary pastry.
- Add a handful of beans or lentils to soups and salads.
- Keep washed fruit and cut vegetables where you can see them.
Drinks and alcohol
NHS says what you drink can affect your weight, and that choosing lower-calorie drinks can help you manage how many calories you have each day. NHS also notes alcohol is high in calories and suggests cutting down.
Water, unsweetened tea or coffee and sparkling water are simple swaps for sugary drinks.
- Notice drinks that carry hidden energy, such as sweetened coffees, juices and cocktails.
- If you take medicines or have a liver condition, ask about safe alcohol limits.
Protein and keeping muscle
A review reported greater short-term fat loss and preserved lean mass with higher-protein energy-restricted diets, but longer-term studies were limited and conflicting. Pairing protein with strength training is covered in Preserve Muscle While Losing Weight.
This site does not give calorie or protein targets. A registered dietitian can set amounts for your size, activity and health.
17Remedies & supplements
Traditional use, laboratory findings and human trials are kept apart. "Natural" does not mean safe.
Viscous (gel-forming) fibre supplements
Low certaintyStudied form and route: Fibre powder or capsules taken with water, or fibre-rich foods
Intended outcome: A small reduction in weight and waist size
Human evidence: A meta-analysis of 62 trials (3,877 people) found added viscous fibre reduced body weight by 0.33 kg and waist circumference by 0.63 cm when people ate as they wished, with moderate certainty for weight.
Limits: The effect is small, and the meta-analysis called for longer trials on sustained weight loss.
Interactions and precautions: Can cause gas, bloating or constipation if increased too fast or taken with too little fluid. Fibre can affect the absorption of some medicines, so ask a pharmacist. Not suitable for people with swallowing problems or bowel obstruction.
13Weight-Loss Supplements, Fat Burners, Detox Teas and Vinegar: Claim Check →
Apple cider vinegar
Low certaintyStudied form and route: Diluted drink or gummies; also used in food
Intended outcome: Possible small short-term reductions in weight, BMI and waist
Human evidence: A 2025 meta-analysis of 10 randomised trials (789 people) found daily apple cider vinegar was associated with lower body weight, BMI and waist, with high variation between studies; benefits were seen for up to 12 weeks.
Traditional use: Long used as a folk remedy for digestion and blood sugar.
Limits: Short trials, differing doses and high heterogeneity; it cannot replace changes to eating and activity.
Interactions and precautions: Undiluted vinegar can damage tooth enamel and irritate the throat and stomach. It may interact with diabetes and some other medicines; check with a pharmacist. Avoid gummies with added sugar.
18Green tea and green tea extract
Mixed findingsStudied form and route: Brewed tea or concentrated extract capsules
Intended outcome: At most a very small effect on weight
Human evidence: A Cochrane review found green tea preparations produced a small, statistically non-significant weight loss unlikely to be clinically important, and no significant effect on keeping weight off. NCCIH says catechins and caffeine may have a modest effect on body weight.
Traditional use: Drunk for centuries across East Asia as a daily beverage.
Limits: Studies were short (about 12 to 13 weeks) and results differed between Japan and elsewhere.
Interactions and precautions: NCCIH lists higher blood pressure among side effects of green tea extract and advises caffeine caution in pregnancy.
19,20Weight-Loss Supplements, Fat Burners, Detox Teas and Vinegar: Claim Check →
Garcinia cambogia
Evidence againstStudied form and route: Capsules or tablets containing the fruit rind extract
Intended outcome: No weight benefit shown in trials
Human evidence: No effect was seen for Garcinia cambogia in a systematic review of 54 placebo-controlled herbal weight-loss trials.
Traditional use: The fruit is used as a souring agent in cooking in parts of South and Southeast Asia.
Limits: Evidence for any benefit is lacking.
Interactions and precautions: A 2025 review found more than 200 reports of liver injury linked to Garcinia supplements, including one death and nine liver transplants among 34 case reports. Avoid, particularly with liver disease, pregnancy or breastfeeding.
21,22Herbal weight-loss products and fat-burner blends
Evidence againstStudied form and route: Capsules, powders or drinks sold as thermogenic or fat-burning
Intended outcome: No reliably meaningful weight loss
Human evidence: The systematic review of 54 trials concluded there was insufficient evidence to recommend any of the herbal medicines assessed, and combinations containing green tea, kidney bean or Ephedra showed statistically but not clinically significant differences.
Limits: Many trials were small and poorly reported, and products vary in content.
Interactions and precautions: The FDA warns that many weight-loss products are likely to contain hidden drug ingredients. Stimulants can raise heart rate and blood pressure. Liver injury has been linked to weight-loss and sports supplements.
21,23,24Detox and slimming teas
Not enough evidenceStudied form and route: Herbal teas sold for cleansing or "flat tummy" effects
Intended outcome: No reliable evidence for fat loss
Human evidence: Proper evidence of weight loss was not found in the sources read for this page; the FDA warns about contaminated weight-loss teas and products.
Traditional use: Herbal teas have long traditional use as drinks; use as slimming products is a modern marketing claim.
Limits: Ingredients can be undeclared.
Interactions and precautions: Some contain laxative or diuretic ingredients that can cause dehydration and low potassium. Avoid in eating-disorder history, pregnancy and breastfeeding.
23Therapies & care
Established professional care for weight loss starts with a conversation with a doctor, nurse or registered dietitian and usually with lifestyle support. NIDDK says that for many adults treating overweight and obesity starts with lifestyle changes, and medicines or surgery may be added by a health professional. The options below are described in general terms, not recommended for you.
Structured weight-management programmes
High certaintyBehavioural and lifestyle support NHS says weight-management programmes can support safe weight loss and help keep weight off, and might include one-to-one coaching, cognitive behavioural therapy, group support, online exercise classes and healthy-eating advice. NIDDK says a safe programme gives ongoing guidance, a reduced-calorie eating plan, a plan for physical activity and a plan for keeping the weight off.
Who it may suit: Adults wanting guided, longer-term support.
Precautions: Check the warning signs of programmes to avoid, and ask about costs and who provides the support. Not a replacement for care of medical conditions.
1,2Registered dietitian or nutrition counselling
Moderate certaintyProfessional nutrition support NIDDK says a health care professional may refer you to a registered dietitian or a specific programme. A dietitian can tailor eating to your health conditions, culture, budget and preferences.
Who it may suit: People with health conditions, food intolerances, or a history of failed diets.
Precautions: Look for a registered or licensed professional.
2Supervised very low calorie diets
Moderate certaintyMedically supervised programme NHS says a dietitian may support a very low calorie diet (under 800 or 1,200 calories a day) and that these diets are not suitable or safe for everyone and are usually only recommended if weight is affecting other health conditions and you need to lose weight quickly. In the DiRECT trial, a clinician-led low-calorie programme in primary care was tested for remission of type 2 diabetes, with medicines withdrawn in a planned way.
Who it may suit: A small group with weight-related conditions, under clinician supervision.
Precautions: Not for self-directed use, pregnancy, breastfeeding, under 18, or eating-disorder history. Medicines may need adjusting.
1,6Prescription weight-loss medicines (decided by a prescriber)
High certaintyMedical treatment, outside the natural-only scope of this site NIDDK says prescription weight-management medicines are meant for people with health problems related to overweight or obesity, are used as part of a programme with healthy eating and physical activity, and that you will probably regain some weight after stopping. NHS says they are usually prescribed alongside diet and lifestyle advice, and that support should be offered after you stop. Whether a medicine is suitable is a decision for your doctor.
Who it may suit: Adults with a clinician-assessed need, as part of a care plan.
Precautions: Side effects, interactions and eligibility vary. Do not obtain them from unregulated sellers; the FDA warns about unapproved and fraudulent versions of such medicines. Do not stop a prescribed medicine suddenly without advice.
25,1,23Metabolic and bariatric surgery
High certaintySurgical care NHS says surgery may be offered at a BMI of 40 or over, or 35 or over with conditions that could improve with weight loss, with lower thresholds for some backgrounds; recovery is usually 3 to 4 weeks with regular check-ups for 2 years.
Who it may suit: People assessed by a specialist team.
Precautions: Major surgery with lifelong nutrition follow-up.
1What to avoid
Habits, products and claims that can get in the way. Never stop a prescribed medicine without talking to the professional who prescribed it.
Risks that apply to most people
Crash diets and unsupervised very low calorie plans
High certaintyWhy: NHS says very low calorie diets (under 800 or 1,200 calories a day) are not suitable or safe for everyone and are usually recommended only, with dietitian support, if weight is affecting other health conditions and you need to lose weight quickly. In a 2-year trial, people regained weight after about 12 months regardless of the diet they started with.
Who it applies to: Anyone who wants rapid results; especially teenagers, older adults, pregnant or breastfeeding people, and people with diabetes.
Try instead: Choose a pace around 0.5 to 1 kg a week and a pattern you could keep, and use a very low calorie diet only under health-professional supervision.
1,3Shame, blame and self-criticism about your body
Moderate certaintyWhy: An international consensus statement says people with obesity commonly face stigma, including in health care, and that weight stigma can cause physical and psychological harm. NIDDK lists many factors beyond willpower that affect weight.
Who it applies to: Anyone trying to lose weight, and anyone supporting them.
Try instead: Use kind, specific goals about habits and health, and ask for respectful care. NHS itself suggests being kind to yourself while changing habits.
26,2,1Relying on exercise alone to move the scale
Moderate certaintyWhy: Aerobic exercise lowered waist size and body fat more clearly than body weight in a meta-analysis of 116 trials, so scale weight alone can understate its benefits. NHS says changing what you eat can help you lose weight, while moving more can help you keep the weight off.
Who it applies to: People who exercise a lot but do not change eating.
Try instead: Combine moderate eating changes with movement, and track waist, strength and energy as well as weight.
8,5Personal triggers to check
Alcohol and sugary drinks
Moderate certaintyWhy: NHS says alcohol is high in calories and that choosing low-calorie drinks can help you manage how much you take in each day.
Who it applies to: People who drink regularly or have sweetened drinks through the day.
Try instead: Swap some sweetened drinks for water or unsweetened options, and keep alcohol low. Ask about alcohol limits if you take medicines.
1,5Short or poor sleep
Low certaintyWhy: NHS says not getting enough sleep can make weight loss harder by making you more likely to choose high-calorie foods and too tired to exercise or cook. A randomised trial found that extending sleep lowered energy intake by about 270 kcal a day.
Who it applies to: Shift workers, parents of young children, and people with insomnia or sleep apnoea.
Try instead: Protect sleep as part of the plan; see sleep goals if you struggle.
5,10A food environment full of ready-to-eat processed food
Low certaintyWhy: In a controlled inpatient trial, adults ate more and gained weight on an ultra-processed diet compared with an unprocessed one.
Who it applies to: People who rely on takeaways, vending machines or packaged snacks.
Try instead: Plan meals, keep easy whole-food options at home and work, and cook in batches.
11Products that need caution
Stimulant fat burners and "thermogenic" supplements
Evidence againstWhy: A systematic review of herbal weight-loss medicines found insufficient evidence to recommend any, and combination products showed differences that were statistically but not clinically significant. The FDA warns that many weight-loss products are likely to contain hidden drug ingredients. A 2017 report described liver injury cases linked to weight-loss and sports supplements, including OxyELITE Pro, in the United States in 2013.
Who it applies to: Anyone tempted by supplements that promise fast fat loss; people with heart conditions, high blood pressure, anxiety or liver disease are at higher risk.
Try instead: Spend the money on food, shoes, a dietitian or a programme instead. Ask a pharmacist before taking any supplement, especially with medicines.
21,23,24Weight-Loss Supplements, Fat Burners, Detox Teas and Vinegar: Claim Check →
Garcinia cambogia supplements
Evidence againstWhy: No weight effect was seen for Garcinia cambogia in the herbal medicines review. A 2025 review identified more than 200 reports of liver injury linked to Garcinia supplements, including 34 case reports with one death and nine liver transplants.
Who it applies to: Anyone considering Garcinia products, especially people with liver disease or who take other liver-affecting medicines.
Try instead: Avoid. Stop and seek medical advice if you have dark urine, yellow skin or eyes, or severe stomach pain after taking a supplement.
21,22Detox teas, cleanses and laxatives used to lose weight
Evidence againstWhy: The FDA warns that many weight-loss teas and supplements are likely to contain hidden drug ingredients. Our weight safety page covers laxative and diuretic misuse, and proper evidence was not found that laxatives are an effective or safe way to control weight.
Who it applies to: Anyone offered a "flat tummy" or cleanse tea; people with eating-disorder history are at particular risk.
Try instead: Avoid. If you are using laxatives, vomiting or diuretics to control weight, speak to a clinician.
23Unsupported claims
"Lose 30 pounds in 30 days" and "lose weight without diet or exercise"
High certaintyWhy: NIDDK lists these promises, along with "lose weight while eating as much as you want of all your favorite foods" and "lose weight in a specific part of your body", as warning signs of a weight-loss programme to avoid.
Who it applies to: Adverts, social media and some commercial programmes.
Try instead: Look for programmes with realistic goals, a reduced-calorie eating plan, activity guidance, ongoing support and a plan for keeping the weight off.
2"One special diet beats all the others"
Moderate certaintyWhy: A 2-year trial found weight loss was similar across diets with different fat, protein and carbohydrate mixes, and attendance at sessions was the strongest factor. A network meta-analysis found most diets lead to modest weight loss at 6 months that largely fades by 12 months.
Who it applies to: Anyone comparing popular diets.
Try instead: Choose the pattern that fits your health, culture and preferences, because adherence matters most. NIDDK says the best plan is one backed by science and tailored to you.
3,15,2"Green tea burns fat"
Moderate certaintyWhy: A Cochrane review found green tea preparations produced a small, statistically non-significant weight loss unlikely to be clinically important; studies outside Japan found a difference of -0.04 kg.
Who it applies to: People buying green tea extracts for weight loss.
Try instead: Enjoy green tea as a drink if you like it, but do not expect weight loss from it,. Ask a pharmacist before taking concentrated extracts.
19Weight-Loss Supplements, Fat Burners, Detox Teas and Vinegar: Claim Check →
"You can boost your metabolism with a food or supplement"
Moderate certaintyWhy: A review describes how weight loss lowers resting metabolic rate and total energy use more than the loss in body size alone would predict, so there is no easy way to raise it back.
Who it applies to: Marketing for "metabolism boosters".
Try instead: Build and keep muscle with strength training and enough protein. See the metabolism myths page.
4Common mistakes
Treating the starting plan as the whole plan
High certaintyWhy: In the 2-year trial, people began regaining weight after about 12 months. NIDDK lists an eating plan suited to your new weight, 150 to 300 minutes or more of physical activity a week and weekly weight monitoring among strategies that may help prevent regain.
Who it applies to: Anyone who has lost weight before and regained it.
Try instead: Plan the second year from the start: choose habits you can keep and arrange ongoing support. See Maintain Progress Over Time.
3,2Changing diabetes or blood pressure medicines on your own
High certaintyWhy: In DiRECT, a clinician-led, low-calorie programme in primary care withdrew glucose-lowering and blood pressure medicines in a planned way as weight fell.
Who it applies to: People with diabetes, high blood pressure or other long-term conditions.
Try instead: Tell your prescriber before you start, and ask how and when your medicines should be reviewed as you lose weight.
6All-or-nothing thinking
Low certaintyWhy: NHS advises setting realistic goals, checking in regularly, and being kind to yourself because changing habits is not easy and takes time.
Who it applies to: People who give up after one off-plan meal or a slow week.
Try instead: Treat a slip as information, return to your next planned meal, and review your plan with your dietitian or group.
1Evidence & safety
What the research shows
Health agencies and trials agree on the basics: a modest, sustained reduction in energy intake, more movement, enough sleep and ongoing support can produce clinically useful weight loss, and 5 to 10% loss improves health. No single diet is clearly best, supplements and fat burners are not supported, and weight regain after the first year is common unless support and habits continue.
Limits of the evidence
- Most diet trials last 6 to 12 months or less and show modest average loss that fades without ongoing support.
- Self-monitoring research is mostly observational and based on self-report.
- Sleep, ultra-processed food and Mediterranean-diet findings come from small, short or subgroup analyses.
- Trials often exclude people with certain conditions, so results may not apply to everyone.
- Supplement trials are short (commonly 12 weeks or less), and product contents vary.
Precautions and interactions
- Natural does not mean safe: several products sold for weight loss have been linked to liver injury or contain hidden drugs.
- Do not change prescribed medicines on your own, especially for diabetes or blood pressure.
- Very low calorie diets need supervision.
- Weight stigma can harm health; seek respectful care.
- Seek help early if eating, weighing or exercising starts to feel out of control.
Life-stage considerations
- Children and teenagers: weight loss should be guided by a paediatric or family clinician; this guide is for adults.
- Pregnancy and breastfeeding: do not diet to lose weight without your midwife or doctor; avoid supplements, herbal teas and fat burners unless approved.
- Older adults: unintended loss of weight and muscle is a concern. Discuss any loss target with a clinician and protect muscle with strength activity.
- Adults with eating-disorder history: avoid self-directed weight-loss plans; seek professional support.
Warning signs
- Unintended weight loss, or rapid unexplained gain or swelling.
- Chest pain, fainting, a racing or irregular heartbeat, or severe breathlessness.
- Yellow skin or eyes, dark urine or severe stomach pain after starting a supplement.
- Restricting, bingeing, purging, fear of eating, or compulsive exercise.
- Low mood, thoughts of self-harm, or feeling hopeless about your body or weight. Contact a doctor or crisis line now.
Claim checks
A special diet is needed to lose weight
Moderate certaintyIn a 2-year trial of 811 adults, weight loss was similar across diets with different fat, protein and carbohydrate mixes. A review of 121 trials found most diets give modest loss at 6 months that largely fades by 12 months.
3,15Intermittent fasting works better than regular dieting
Low certaintyA 2026 Cochrane review found it may result in little to no difference in weight loss compared with regular dietary advice (low-certainty evidence).
14Exercise alone will melt the weight
Moderate certaintyA meta-analysis of 116 trials found 30 minutes a week of aerobic exercise was associated with 0.52 kg lower weight, with larger effects on waist and body fat at 150 minutes a week.
8Fat burners and herbal weight-loss pills work
Evidence againstA systematic review of 54 trials found insufficient evidence to recommend any herbal medicine, and warnings exist about contamination and liver injury.
21,23,24Green tea burns fat
Mixed findingsCochrane found a small, non-significant effect on weight.
19Apple cider vinegar melts weight
Low certaintyA 2025 meta-analysis found small short-term reductions with high variation between trials.
18Sleeping more helps weight loss
Low certaintyA small randomised trial found sleep extension reduced energy intake by about 270 kcal a day in adults with short sleep.
10Questions people ask
How fast should I lose weight?
NHS suggests aiming to lose about 0.5 to 1 kg (1 to 2 lb) a week, and NIDDK says experts recommend an initial goal of 5% to 10% of starting weight within 6 months. Faster loss is not recommended without supervision.
Is a small amount of weight loss worth it?
Yes. NHS says losing 5 to 10% of your body weight can improve health for people living with overweight or obesity.
Which diet is best for losing weight?
Trials have not found one best diet. Weight loss in a 2-year trial was similar across different fat, protein and carbohydrate mixes, and a large review found most diets work modestly at 6 months and fade by 12 months. Choose a pattern you can keep and that suits your health.
Why do I regain weight?
After weight loss, hunger can rise and energy use can fall more than expected, which makes regain common. Ongoing support and habits you can keep help; see Maintain Progress Over Time.
Do I need to count calories?
Not necessarily. A review found a consistent association between self-monitoring and weight loss but rated the evidence as weak. NHS says calorie awareness can be useful. Counting can be unhelpful for some people, especially with an eating-disorder history. This page gives no calorie targets.
How much exercise do I need?
A meta-analysis found about 150 minutes a week of moderate to vigorous aerobic activity gave clinically important drops in waist and body fat, though weight changed less. Start with what you can do and build up.
Do fat burners, detox teas or garcinia work?
The evidence does not support them. A systematic review found insufficient evidence to recommend herbal weight-loss medicines, and Garcinia has been linked to liver injury. The FDA warns of hidden drug ingredients.
What about weight-loss medicines or surgery?
These are medical options decided by a clinician for people who meet criteria, used with lifestyle support. See Weight-Loss Medications and Medical Care for an educational overview.
Can I lose weight if I have diabetes or take regular medicines?
Often yes, but plan with your clinician first because medicines may need to be adjusted as you lose weight. Do not stop or change diabetes or blood pressure medicines on your own.
Should I lose weight if I am pregnant, breastfeeding or under 18?
Not on your own. Ask your midwife, doctor or paediatric clinician for guidance.
When is weight loss a sign of a problem?
Weight loss you did not intend, or gain without a clear reason, needs a medical check. See Unintentional Weight Loss and Why Weight Changes.
What if food, weighing or exercise feels out of control?
Please speak to a doctor or an eating-disorder service. Restriction, bingeing, purging or fear of eating need professional support; see Eating Disorders and Disordered Eating. In the US you can call or text 988 in a crisis.
References
- NHS. Overweight and obesity in adults. Read 2026-10-31. source
- NIDDK. Choosing a Safe & Successful Weight-loss Program. Read 2026-10-31. source
- Sacks FM et al. Comparison of weight-loss diets with different compositions of fat, protein, and carbohydrates. N Engl J Med 2009. PMID 19246357. source
- Melby CL et al. Attenuating the Biologic Drive for Weight Regain Following Weight Loss: Must What Goes Down Always Go Back Up? Nutrients 2017. PMID 28481261. source
- NHS Better Health. How to lose weight. Read 2026-10-31. source
- Lean MEJ et al. Primary care-led weight management for remission of type 2 diabetes (DiRECT): an open-label, cluster-randomised trial. Lancet 2018. PMID 29221645. source
- NHS. Understanding calories (last reviewed 17 April 2023). Read 2026-10-31. source
- Jayedi A et al. Aerobic Exercise and Weight Loss in Adults: A Systematic Review and Dose-Response Meta-Analysis. JAMA Netw Open 2024. PMID 39724371. source
- Burke LE et al. Self-monitoring in weight loss: a systematic review of the literature. J Am Diet Assoc 2011. PMID 21185970. source
- Tasali E et al. Effect of Sleep Extension on Objectively Assessed Energy Intake Among Adults With Overweight in Real-life Settings. JAMA Intern Med 2022. PMID 35129580. source
- Hall KD et al. Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake. Cell Metab 2019. PMID 31105044. source
- Konieczna J et al. An Energy-Reduced Mediterranean Diet, Physical Activity, and Body Composition: An Interim Subgroup Analysis of the PREDIMED-Plus Randomized Clinical Trial. JAMA Netw Open 2023. PMID 37851444. source
- Jovanovski E et al. Can dietary viscous fiber affect body weight independently of an energy-restrictive diet? A systematic review and meta-analysis. Am J Clin Nutr 2020. PMID 31897475. source
- Garegnani LI et al. Intermittent fasting for adults with overweight or obesity. Cochrane Database Syst Rev 2026. PMID 41692034. source
- Ge L et al. Comparison of dietary macronutrient patterns of 14 popular named dietary programmes for weight and cardiovascular risk factor reduction in adults. BMJ 2020. PMID 32238384. source
- Tobias DK et al. Effect of low-fat diet interventions versus other diet interventions on long-term weight change in adults: a systematic review and meta-analysis. Lancet Diabetes Endocrinol 2015. PMID 26527511. source
- Leidy HJ et al. The role of protein in weight loss and maintenance. Am J Clin Nutr 2015. PMID 25926512. source
- Castagna A et al. Effect of Apple Cider Vinegar Intake on Body Composition in Humans with Type 2 Diabetes and/or Overweight: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Nutrients 2025. PMID 41010525. source
- Jurgens TM et al. Green tea for weight loss and weight maintenance in overweight or obese adults. Cochrane Database Syst Rev 2012. PMID 23235664. source
- NCCIH. Green tea. Cited on this site's claim-check page, read 2026-10-22. source
- Maunder A et al. Effectiveness of herbal medicines for weight loss: A systematic review and meta-analysis of randomized controlled trials. Diabetes Obes Metab 2020. PMID 31984610. source
- van Breemen RB et al. Hepatotoxicity of dietary supplements containing Garcinia gummi-gutta (L.) N. Robson. Pharm Biol 2025. PMID 41262061. source
- US FDA. Tainted weight loss products. Cited on this site's weight safety page, read 2026-10-22; the FDA page itself could not be re-fetched on 2026-10-31. source
- Chatham-Stephens K et al. Hepatotoxicity associated with weight loss or sports dietary supplements, including OxyELITE Pro, United States, 2013. Drug Test Anal 2017. PMID 27367536. source
- NIDDK. Prescription Medications to Treat Overweight & Obesity. Read 2026-10-31. source
- Rubino F et al. Joint international consensus statement for ending stigma of obesity. Nat Med 2020. PMID 32127716. source
Related on AlternativeMed
Related goals
Maintain a Healthy Weight → Preserve Muscle While Losing Weight → Manage Hunger & Cravings → Build More Balanced Eating Habits → Understand Weight-Loss Plateaus → Maintain Progress Over Time → Support Healthy Blood Sugar → Improve Your Metabolic Health → Manage Weight Changes in Midlife → Gain Weight Safely →
Ingredients, foods and supplements
Apple cider vinegar → Detox and weight-loss teas → Detox claims →
Research, safety and claim-check resources
Weight-Loss Supplements, Fat Burners, Detox Teas and Vinegar: Claim Check → Weight-Loss Medications and Medical Care → Weight and Metabolism Safety → Weight and Metabolism Research and Evidence → Metabolism: What It Is and Whether You Can Boost It → BMI, Body Composition and Muscle → Medicines That Can Change Weight → Sleep, Stress and the Food Environment → Talking With a Health Professional →