Browse the evidence

Preventing population-level weight gain in China requires closing a daily energy gap of approximately 45 kcal, achievable through small lifestyle changes such as reducing energy intake by 2-3% or adding 10-15 minutes of brisk walking daily.

To prevent weight gain, you do not need to overhaul your diet or exercise routine. Simply reduce your daily calorie intake by about 45 calories (roughly 2-3% of a standard diet) or add 10-15 minutes of brisk walking to your day. These small, sustainable changes are sufficient to offset the average energy surplus driving population weight gain.

Dietary behavior modification inducing sustained weight loss (approx. 10%) in overweight/obese lactating women significantly improves cardiovascular risk factors, including reduced waist circumference, total/LDL cholesterol, and fasting insulin, and increased HDL cholesterol.

For overweight or obese women in the postpartum period, a structured dietary intervention aiming for a modest 0.5 kg/week weight loss through a 500 kcal daily deficit can significantly improve long-term cardiovascular health markers (like cholesterol and insulin sensitivity) without harming breast milk. Exercise alone was not effective in this study, suggesting diet is the primary lever for metabolic improvement in this specific context.

Ad libitum consumption of fat-reduced diets produces significant weight loss over long-term periods (up to 7 years) and reduces cardiovascular risk factors and type 2 diabetes incidence.

To lose weight sustainably, reduce your total fat intake by about 10% of your daily calories without counting every calorie. Focus on filling your plate with fruits, vegetables, and whole grains to keep you full. Combine this with regular exercise to maximize health benefits and reduce diabetes risk.

Increasing dietary protein to 20-30% of calories (at the expense of carbohydrates) increases satiety and induces spontaneous weight loss, particularly beneficial for patients with metabolic syndrome or type 2 diabetes.

If you struggle with hunger or have metabolic issues, try increasing your protein intake to 20-30% of your daily calories. Replace some carbohydrates and fats with lean protein sources like chicken, fish, or low-fat dairy. This can help you feel fuller and lose weight without strict calorie counting.

A 6-month lifestyle intervention combining moderate caloric restriction (250–350 kcal/day deficit) with low-intensity aerobic exercise (walking at 50–60% heart rate reserve) effectively resolves metabolic syndrome in obese postmenopausal women, primarily through reductions in fat mass.

For obese postmenopausal women, a 6-month program of modest calorie cutting (250-350 kcal/day) combined with regular, low-intensity walking (50-60% of max heart rate) is highly effective at reversing metabolic syndrome. The key is fat loss, not high-intensity cardio. This approach also helps preserve muscle mass, which is critical for older adults.

Caloric restriction (20-30% reduction) significantly improves cardiometabolic health by reducing body weight, BMI, fat mass, total cholesterol, and LDL, while having no significant effect on blood pressure or HDL.

To improve metabolic health, reduce your daily caloric intake by 20-30% while ensuring you still get all essential nutrients. Expect significant weight loss and improved cholesterol levels, but do not expect blood pressure or HDL changes to be guaranteed outcomes.

Time-restricted eating (TRE) with an 8-hour daily eating window significantly reduces body weight and fat mass in adults with obesity compared to control groups, particularly when the intervention lasts longer than 12 weeks.

If you have obesity, try restricting your eating to an 8-hour window each day (e.g., 10 AM to 6 PM). This approach is more effective for weight and fat loss than no time restriction, especially if you stick with it for more than 3 months. While it doesn't significantly change blood sugar or cholesterol markers in obese adults, it is a viable strategy for weight management. Be aware that adherence may be challenging due to social obligations, so consistency is key.

Weekly physical activity volumes of 700 minutes of moderate intensity or 350 minutes of vigorous intensity maximize all-cause mortality reduction, significantly exceeding the standard 150-minute guideline.

Aim for 700 minutes of moderate activity (like brisk walking) or 350 minutes of vigorous activity (like running) per week for maximum longevity benefits. This is roughly double the standard recommendation. You can achieve this through a mix of exercise and daily living activities like gardening or active commuting. If you are a man, vigorous activity may offer slightly more benefit; if a woman, moderate activity is highly effective. Start with the minimum 150 minutes and gradually increase toward 700 minutes.

Replacing sitting time with physical activity eliminates the increased mortality risk associated with high sedentary behavior, particularly when achieving ≥420 minutes of moderate-to-vigorous PA per week.

If you have a sedentary job, do not rely on short workouts. Aim for at least 420 minutes of moderate-to-vigorous activity per week (e.g., brisk walking, running) to cancel out the risks of sitting. This is a significant amount of time, so integrate activity into your day through commuting, breaks, and leisure.

A low-energy total diet replacement (TDR) intervention (800-820 kcal/day formula diet) combined with behavioral support significantly reduces body weight, insulin requirements, and improves quality of life in patients with long-standing type 2 diabetes and obesity treated with insulin.

If you have long-standing type 2 diabetes and take insulin, a structured low-calorie formula diet (around 800 calories/day) for 12 weeks, followed by a gradual return to solid foods with ongoing support, can help you lose significant weight and potentially reduce or stop your insulin. This must be done under medical supervision to adjust your insulin doses safely and prevent low blood sugar. The key is the initial energy deficit combined with behavioral support.

A 12-week energy-restricted diet intervention produces similar beneficial reductions in body weight, fat mass, and insulin resistance in both metabolically abnormal obese (MAO) and metabolically healthy but obese (MHO) premenopausal women.

If you are an obese premenopausal woman, whether your blood markers are currently normal (MHO) or abnormal (MAO), a structured 12-week diet creating a moderate caloric deficit (approx. 600 kcal/day below your needs) will effectively reduce your weight and improve your metabolic health. Do not skip intervention just because you feel 'healthy' now; the benefits of weight loss apply to you just as much as to those with metabolic issues.

Moderating dietary fat intake to approximately 25% of total energy, combined with regular physical activity, is a key strategy for long-term weight loss maintenance.

If you have lost weight, aim to keep your fat intake around 25% of your total calories and engage in regular physical activity (approx. 400 kcal/day). This combination is a proven strategy for maintaining significant weight loss over the long term.

Intermittent Energy Restriction (IER) diets, including Alternate-Day Fasting (ADF) and Time-Restricted Feeding (TRF), produce weight loss and metabolic improvements (reduced triglycerides, LDL, and blood pressure) that are comparable to Continuous Energy Restriction (CER) diets when total caloric intake is matched.

If you struggle with daily calorie counting, try Intermittent Energy Restriction. You can either fast on alternate days (eating very little or nothing on fast days) or restrict your eating to a specific window (e.g., 8 hours) each day. The goal is to reduce total weekly calories, not necessarily to eat less every single day. Expect to lose about 3-8% of your body weight over 2-3 months, similar to what you would get from eating less every day.

Commercially available very low-calorie diets (VLCDs) with intensive behavioral support produce significantly greater weight loss and cardiovascular risk improvement than low-carbohydrate/high-protein (LCHP) diets in obese patients who fail to respond to standard low-fat diets.

If you have a BMI over 35 and standard dieting hasn't worked, a medically supervised very low-calorie diet (VLCD) combined with weekly group support is significantly more effective for weight loss than a low-carb diet. The key to success is not just the low calories, but the structured support and counseling provided by the program. Expect to lose significant weight (over 15kg on average in this study) if you stick with the program for 9 months.

Consuming high-fiber rye products as part of a hypocaloric diet for 12 weeks causes greater body weight and body fat loss compared to consuming refined wheat products, independent of subjective appetite responses.

If you are trying to lose weight on a calorie-restricted diet, replace your refined wheat products (bread, cereal, crispbread) with high-fiber rye products. In this 12-week study, this swap resulted in significantly more weight and fat loss (1.08 kg and 0.54% body fat more) compared to wheat, even though participants didn't feel less hungry. You must still maintain your calorie deficit; rye is not a free pass to eat more calories.

Adhering to a low energy-dense (LED) diet significantly reduces total daily energy intake and improves appetite control (increased fullness, reduced hunger/cravings) in overweight and obese women, leading to greater weight loss compared to standard calorie-restriction programs.

To lose weight effectively, focus on eating foods with low energy density (high volume, low calories, like vegetables, fruits, lean proteins) rather than just counting calories. This approach allows you to eat until you are full, reduces hunger and cravings, and makes sticking to your diet easier and more enjoyable than strict calorie restriction.

Interventions that enhance satiety and/or reduce hunger lead to a statistically significant reduction in body weight (average 3.60 kg greater than controls) in individuals with overweight or obesity when sustained over 8+ weeks.

If you struggle with hunger while dieting, try incorporating foods specifically designed to increase satiety or reduce hunger. These foods can help you eat less automatically, leading to an average extra weight loss of about 3.6 kg compared to standard diets over 8 weeks or more. Look for products that claim to enhance fullness.

Individual reductions in ad libitum energy intake explain a significant portion (23-58%) of the variation in subsequent weight loss, linking acute appetite effects to long-term weight management.

Focus on how full you feel. Studies show that when you eat foods that make you feel fuller, you naturally eat fewer calories, and this reduction in calories directly leads to more weight loss. It's not just about willpower; it's about choosing foods that work with your body's hunger signals.

A ketogenic diet (KD) significantly reduces body weight, BMI, fat mass, waist circumference, visceral adipose tissue, and percentage body fat compared to low-fat diets in adults, but also causes a small reduction in fat-free and lean body mass.

Adopting a ketogenic diet (high fat, very low carb) for 2-96 weeks leads to significant weight loss, reduced body fat, and improved waist circumference compared to low-fat diets. However, be aware that you may also lose a small amount of lean muscle mass (-0.63 kg). This diet is effective for body recomposition in adults, but long-term adherence can be challenging.

A 3-month low-calorie diet (1,200–1,500 kcal/day) significantly reduces the thickness of intra-abdominal preperitoneal and visceral fat layers in obese women, with preperitoneal fat showing the strongest correlation to overall weight loss.

If you are an obese woman aiming to lose weight, a strict low-calorie diet (1,200-1,500 kcal/day) for 3 months will effectively reduce dangerous intra-abdominal fat. While waist measurements might not change dramatically, internal fat layers shrink significantly. Use sonography if available to monitor this specific loss, as it is more accurate than waist-to-hip ratios for tracking visceral fat reduction.

Fatmax training (FMT) performed for 8-20 weeks significantly reduces body weight, fat mass, and waist circumference in obese individuals without altering fat-free mass.

To lose fat without losing muscle, train at your specific 'Fatmax' intensity (where your body burns the most fat) for 8-20 weeks, 3-5 times a week. This intensity is usually moderate (40-50% of your max oxygen uptake). Do not combine this with a strict diet, as the study showed fat loss occurred even without caloric restriction. This approach preserves muscle mass while reducing total and abdominal fat.

Interval training (HIIT and SIT) produces significantly greater reductions in total body fat percentage compared to moderate-intensity continuous training (MICT) and non-exercise control (CON) in apparently healthy adults.

If you want to lose body fat, interval training (HIIT or SIT) is more effective than steady-state cardio (MICT) or no exercise. You don't need to do long sessions; even low-volume HIIT (under 15 minutes of high-intensity work per session) can be superior. This is especially true if you have overweight or obesity, or if you stick with the program for at least 12 weeks.

A high-protein/low-carbohydrate (HP) diet provides superior metabolic improvement (glucose, insulin, HOMA-IR, lipids) compared to a standard hypocaloric diet, regardless of FTO genotype.

If you are obese and have the FTO variant, switching to a high-protein, lower-carbohydrate diet (approx. 33% carbs) will improve your blood sugar and cholesterol markers more effectively than a standard low-calorie diet, even if the total weight loss is similar.

The Football Fans in Training (FFIT) weight management programme, delivered through professional football clubs, produces significant long-term weight loss (mean 2.90 kg) and sustained improvements in physical activity, diet, and psychological well-being in men aged 35-65, with effects persisting up to 3.5 years post-intervention.

If you are a man interested in football, joining a structured weight loss program delivered through a local football club can help you lose weight and keep it off. The FFIT program uses your team loyalty to motivate you to make small, sustainable changes to your physical activity and diet, leading to significant long-term health benefits.