Browse the evidence

Repeated intensive lifestyle interventions (ILIs) consisting of hypocaloric diet and daily physical activity lead to progressive, cumulative weight loss and maintenance, with only modest weight regain between interventions.

If you are severely obese, a single short-term diet and exercise program is unlikely to keep the weight off long-term. However, participating in repeated, structured residential programs (approx. 3 months each) with a moderate caloric deficit and daily exercise can lead to significant, cumulative weight loss over several years. The key is not expecting the first attempt to be permanent, but using repeated interventions to progressively lower your baseline weight.

A 9-month intensive lifestyle intervention (dietary modification and increased physical activity) produces significant short-term weight loss and improved glycemic control in young women with prior gestational diabetes and newly diagnosed type 2 diabetes, with weight loss effects persisting for at least 6 years.

If you are a young woman with a history of gestational diabetes who has recently been diagnosed with type 2 diabetes, committing to a structured 9-month lifestyle program can help you lose about 4% of your body weight and improve your blood sugar control. Key steps include reducing daily calorie intake by roughly 200-240 calories, limiting fat to less than 30% of your diet, eating 20-30g of fiber daily, and exercising moderately for 30 minutes every day. Even after the program ends, the weight loss benefit can last for at least 6 years, though blood sugar control may require ongoing attention.

Combining dietary caloric restriction with exercise yields greater fat loss and lean mass preservation than diet or exercise alone in PCOS.

To lose fat and keep muscle in PCOS, do not rely on exercise alone. Create a modest calorie deficit (500-750 kcal/day) and engage in 150-300 minutes of moderate exercise or 75-150 minutes of vigorous exercise weekly, plus two days of resistance training. This combination is superior to either method in isolation.

Time-restricted eating (TRE) is currently the most prevalent and hottest research topic for obesity intervention, showing equivalent weight loss to continuous energy restriction while offering better long-term adherence.

If you are struggling to stick to a diet, try Time-Restricted Eating (TRE). Instead of counting every calorie all day, restrict your eating to a specific window (e.g., 8 hours) and fast for the rest. Research suggests this is just as effective for weight loss as traditional dieting but easier to stick to long-term because it simplifies decision-making and may improve adherence.

Beta-alanine supplementation (3-6 g/day for 4-8 weeks) delays fatigue in weightlifting by increasing muscle carnosine levels and buffering acidosis.

Take 3-6 grams of beta-alanine daily for at least 4 weeks to build up muscle carnosine. Split the dose (e.g., 2 grams twice a day) to avoid the harmless tingling sensation.

A 3-month low energy diet (800-900 kcal/d) combined with professional dietitian support and subsequent exercise intervention produces significant, sustained weight loss and improves cardiometabolic markers in adults with obesity and chronic kidney disease (CKD) stages G1-G3b.

If you have obesity and early-stage kidney disease, a structured low-calorie diet (800-900 calories) using meal replacements, supported by a dietitian and exercise professional, is a safe and effective way to lose significant weight (approx. 9kg over 6 months) and improve blood pressure and waist size. It requires professional oversight to manage blood sugar and kidney markers, but it does not inherently harm kidney function or muscle strength when monitored.

A peer-supported, WhatsApp-assisted lifestyle modification intervention significantly reduces daily calorie intake and leads to modest weight loss in adults with overweight/obesity in low-resource urban settings.

To lose weight in a resource-limited setting, focus on reducing daily calorie intake by approximately 386 kcal through portion control and healthier food choices. Use a peer-support model where a family member helps you stay accountable via regular check-ins (e.g., WhatsApp). While physical activity is beneficial, this study suggests that dietary changes were the primary driver of the observed weight loss (2.2 kg over 1 year). Consistency through monthly reviews and peer encouragement is key to maintaining these habits.

Higher training volume (moderate to high) is associated with higher responder rates for muscle hypertrophy compared to low volume, although intensity can compensate for low volume.

If you have time to train, moderate to high volume (8-24 sets per muscle group per week) is likely to yield better hypertrophy results than very low volume. However, if you are time-crunched, high-intensity low-volume training can still be effective. Prioritize consistency and intensity over sheer volume if necessary.

Muscle strength responsiveness is influenced by training intensity and specificity of the test, with higher loads generally leading to greater strength gains, and test specificity affecting the observed response.

To maximize strength gains, prioritize higher loads (e.g., 70-90% 1RM) over very light weights. Ensure your training intensity matches the goal of strength. If you are new to training, start with moderate loads and progressively increase intensity.

Weight loss is significantly associated with greater HbA1c reduction in patients following a carbohydrate-reduced diet.

Losing weight will significantly improve your blood sugar levels. For every kilogram you lose, your HbA1c is expected to drop by approximately 0.56 mmol/mol. Focus on sustainable weight loss through the carbohydrate-reduced diet and health coaching.

Alternate-day fasting (ADF) and whole-day fasting protocols effectively reduce body weight, body fat, total cholesterol, and triglycerides in normal-weight, overweight, and obese adults over short-term periods (3-24 weeks).

To lose weight and improve cholesterol, try alternating between normal eating days and fasting days where you eat only one small meal (about 25% of your daily calories). Alternatively, fast completely or partially for 1-2 days a week. Stick to this for at least 3 weeks to see results. This approach works for various body types and is often easier to sustain than daily calorie counting.

Sustained calorie restriction (1750–2100 kcal/day) in healthy, non-obese humans significantly improves cardiovascular and metabolic biomarkers, including reducing BMI, blood pressure, fasting insulin, glucose, and cholesterol, while maintaining excellent physical and mental health.

To improve metabolic health, you can adopt a calorie-restricted diet focused on nutrient density. Aim for 1750-2100 kcal daily, prioritizing complex carbohydrates, vegetables, and fruits, while ensuring you get adequate protein and essential vitamins. This approach has been shown to significantly lower BMI, blood pressure, insulin, and cholesterol in healthy adults without compromising physical or mental performance, provided the diet is well-planned and nutrient-rich.

Very low calorie diets (VLCDs) providing less than 800 kcal/day produce rapid, large weight losses (average 20 kg in 12 weeks) in moderately to severely obese adults, significantly outperforming conventional behavioral or pharmacological treatments.

If you have severe obesity, a medically supervised VLCD (under 800 calories/day) is the most effective non-surgical way to lose weight quickly, averaging 20kg in 3 months. It is not safe to do this alone; you need medical monitoring, high-quality protein, and supplements to prevent heart and muscle damage. The main challenge is keeping the weight off after you stop.

Modified alternate-day fasting (ADF) significantly reduces body weight, BMI, waist circumference, and blood pressure in overweight/obese women over a 6-week period.

Try a modified alternate-day fasting schedule for 6 weeks. Eat very little (about 25-30% of your needs) on 3 specific days (e.g., Sat, Mon, Wed) and eat normally (around 1700-1800 kcal) on the other 3 days. This approach significantly reduces weight and blood pressure in obese women, potentially offering a more flexible alternative to daily dieting.

Lifestyle interventions incorporating physical activity significantly reduce body weight (mean difference 8.9 kg) and BMI (2.8 kg/m²) in individuals with Class II and III obesity (BMI ≥ 35 kg/m²).

For individuals with Class II or III obesity, combining dietary changes (specifically caloric restriction) with physical activity leads to significant weight loss (averaging nearly 9 kg) and improved health markers. The intensity and supervision of the exercise can vary, but consistent engagement in these lifestyle changes is effective for this population.

Lifestyle interventions with physical activity significantly improve specific cardiometabolic risk factors (fat mass, waist circumference, blood pressure, total cholesterol, LDL-C, triglycerides, fasting insulin) in Class II and III obese individuals, but do not significantly affect HDL-C or fasting blood glucose.

While lifestyle changes improve blood pressure, cholesterol, and insulin sensitivity in severe obesity, they may not automatically normalize HDL cholesterol or fasting blood glucose levels for everyone. Monitoring these specific markers is important even if weight loss is achieved.

Restricting energy intake between 19:00 and 06:00 hours significantly reduces total daily energy intake and body weight in healthy young men over a short-term (2-week) period.

To reduce your daily calorie intake without counting calories, stop eating after 7 PM. This study shows that simply avoiding food between 7 PM and 6 AM led to a significant drop in daily energy intake and weight loss in young men over two weeks. You can drink water during this window. This is a simple 'small-changes' approach that may help prevent weight gain.

A proprietary weight loss program combining a 12-week very-low-calorie diet (VLCD) with behavioral lifestyle modification achieves long-term weight maintenance (≥5% loss) in a substantial portion of patients with marked obesity, despite significant initial weight regain.

To achieve long-term weight loss, consider a structured program that starts with a short period (12 weeks) of very low-calorie intake (400-800 kcal) followed by a gradual transition to normal foods and behavioral counseling. Success is defined as maintaining at least 5% of your initial weight loss, even if you regain some weight in the first few years. This approach has been shown to work for a significant portion of people with marked obesity over 5 years.

A structured 12-month primary care program using a low-energy liquid diet (LELD) followed by food reintroduction and maintenance achieves a clinically significant, sustained weight loss of ≥15 kg in approximately one-third of severely obese patients (BMI ≥40 kg/m2).

If you have severe obesity (BMI 40+), a structured program using a low-calorie liquid diet for 12 weeks, followed by a gradual return to solid foods and maintenance support, can help you lose and keep off at least 33 pounds (15 kg). This approach is feasible in regular doctor's offices and costs much less than surgery, offering a viable alternative for those who cannot access or prefer not to have surgery.

Adherence to a Protein-Sparing Modified Fast (PSMF) for 17+ weeks results in significant weight loss (mean 47 lbs) and improved cardiovascular markers (blood pressure, triglycerides) in obese outpatients.

To lose significant weight and improve blood pressure, you can use a supervised, very low-calorie diet (under 800 calories) that includes high-quality protein (1.5g per kg of your ideal weight). This must be done under medical supervision, combined with education and exercise, and typically lasts around 17 weeks.

PSMF leads to significant reductions in systolic and diastolic blood pressure, fasting blood sugar, and serum triglycerides.

Losing weight through this diet significantly improves your blood pressure, blood sugar, and triglyceride levels.

A short-term low-calorie diet intervention (approx. 5,023 kJ/day) significantly reduces serum advanced glycation end products (AGEs) in healthy overweight or obese adults, with the reduction correlating with decreases in BMI, waist circumference, and triglycerides.

If you are overweight or obese, adopting a low-calorie diet that creates a caloric deficit (specifically around 1,200 kcal/day in this study) for two months can significantly lower your blood levels of Advanced Glycation End Products (AGEs). This reduction is linked to your weight loss and improved lipid profiles, suggesting a direct benefit to reducing inflammation and cardiovascular risk markers through simple caloric restriction.

Intermittent Energy Restriction combined with a Mediterranean diet (IER+MED) significantly reduces visceral adipose tissue (VAT) and total fat mass more effectively than a continuous euenergetic DASH diet over 12 weeks.

To reduce visceral fat, try restricting calories to 30% of your normal intake for two consecutive days each week, while eating a Mediterranean-style diet (rich in plants, olive oil, fish) on the other five days. This approach may reduce belly fat more effectively than just eating a healthy diet every day without restriction. Ensure you are physically active, aiming for an hour of moderate exercise most days.

Intermittent energy restriction (IER) involving 2-3 fasting days per week produces greater short-term absolute weight loss and percentage of weight loss compared to continuous energy restriction (CER) when total energy deficit is matched.

If you struggle with daily calorie counting, try restricting calories to 400-600 kcal on 2-3 days a week (fasting days) and eating normally on the other days. This method may help you lose more weight in the short term (under 6 months) than eating slightly less every day, provided your total weekly calories are similar to the daily restriction approach.