Browse the evidence

High-dose exercise (300-330 min/week) preserves fat-free mass during caloric restriction in type 2 diabetes, whereas moderate exercise (150-165 min/week) and diet-only interventions result in fat-free mass loss.

If you have type 2 diabetes and are dieting, you risk losing muscle. To stop this, you need high-volume exercise (at least 5 hours a week) including weights. Standard '150 minutes of exercise' guidelines are not enough to protect your muscle mass during weight loss.

Combined exercise and dietary interventions produce significantly greater body weight loss than exercise alone in adults with overweight or obesity, but do not significantly reduce ectopic fat (liver fat, visceral fat area, or intramuscular triglycerides) compared to exercise alone.

If your goal is simply to lose body weight, adding exercise to your diet will help you lose more weight than dieting alone. However, if your specific goal is to reduce ectopic fat (fat in your liver, visceral area, or muscles), simply combining diet and exercise may not be more effective than exercise alone. You may need to focus on specific types of exercise or longer durations (>12 weeks) to target these specific fat depots, as general weight loss does not guarantee ectopic fat reduction.

Long-term interventions (>12 weeks) involving either exercise or caloric restriction are successful in decreasing visceral fat area (VFA) in adults with overweight or obesity, whereas short-term interventions may not be.

To reduce visceral fat, you need to stick with your exercise or diet plan for more than 12 weeks. Short-term efforts may not be enough to target this specific type of fat. Consistency over time is key.

A hypocaloric diet leads to statistically significant weight loss in adults with overweight or obesity regardless of whether the macronutrient composition is high-protein or high-carbohydrate.

To lose weight, you must create a caloric deficit. This study shows that whether you get those calories from protein or carbohydrates matters less than the total calorie reduction. A daily reduction of 500 kcal led to significant weight loss regardless of the macronutrient split. Choose the diet composition you can sustain best while maintaining this deficit.

A modest reduced-calorie diet (75% of energy requirements) for two months significantly improves lipid profiles, blood pressure, and specific inflammatory markers (ICAM-1, MCP-1) in overweight/obese adults with cardiovascular risk factors.

If you are overweight or obese and have high blood pressure, cholesterol, or blood sugar, cutting your daily calories to 75% of what your body normally burns (a 25% reduction) for two months can significantly lower your bad cholesterol, triglycerides, and blood pressure. It also reduces specific markers of blood vessel inflammation. You do not need to change your exercise routine, but you should avoid omega-3 supplements during this period. Focus on filling your reduced calories with vegetables, fruits, and lean proteins to stay full.

A daily caloric deficit of 500-1,000 kcal (low-calorie diet) produces a weight loss of 0.5-1.0 kg per week and up to 10% body weight over 6 months.

To lose weight steadily, reduce your daily calorie intake by 500 to 1,000 calories compared to what you normally eat. This moderate deficit typically results in losing 0.5 to 1.0 kg per week. Over six months, this approach can help you lose about 10% of your body weight. Focus on sustainable habits rather than extreme restriction.

In well-trained males, full-body resistance training routines produce significantly greater fat mass loss than split-body routines when weekly training volume is matched.

If you are an experienced male lifter trying to lose fat, switch to a full-body routine (training all major muscle groups 5 days a week) instead of splitting body parts across the week. Keep your total weekly sets the same (around 75 sets). This approach will likely help you lose more fat because you will feel less sore and move more during the rest of your day, burning more calories overall.

Progressive weight loss exceeding 30% induces 100% remission of hyperinsulinemia (HI) and insulin resistance (IR) in individuals with overweight or obesity, whereas lower weight loss thresholds yield partial or no remission.

If you have high insulin or insulin resistance, losing a small amount of weight (5-10%) will help your health, but it likely won't cure the metabolic issue. To fully reverse hyperinsulinemia and insulin resistance, you generally need to lose more than 30% of your body weight through a sustained, intensive lifestyle and medical program over a year.

Lifestyle modifications (diet and physical activity) produce 5-10% weight loss and improve metabolic health, serving as the recommended first-line therapy for obesity.

Adopt a sustainable diet that creates a caloric deficit and engage in regular physical activity, including both aerobic exercise and strength training. This approach reliably yields 5-10% body weight loss and improves metabolic health markers like blood pressure and HbA1c. Consistency and realistic goal-setting are key to long-term success.

Time-restricted eating (TRE) significantly reduces body weight, fat mass, BMI, and waist circumference in adults, but does not significantly reduce fat mass percentage.

If you are an adult looking to lose weight and body fat, restricting your daily eating window to 12-20 hours (fasting for 4-12 hours) is an effective strategy. You can expect significant reductions in body weight, waist circumference, and fat mass. However, be aware that this method also leads to a loss of fat-free mass (muscle) and does not significantly change your body fat percentage. It is not necessarily superior to standard calorie restriction for weight loss, but may be easier to adhere to for some people.

Reducing total caloric intake by 500-1,000 kcal daily (Low-Calorie Diet) is a safe, practical, and effective primary strategy for obesity management, yielding 0.5-1.0 kg weight loss per week.

To lose weight safely, reduce your daily calories by 500 to 1,000 compared to what you normally eat. This simple deficit typically results in losing 0.5 to 1.0 kg per week and is considered safe for most people without strict medical supervision.

Intermittent fasting (16:8 time-restricted eating) produces significantly greater weight loss and improvements in fasting glucose and triglycerides compared to standard calorie restriction in obese adults over an 8-week period.

If you are obese and struggling with weight loss, try a 16:8 intermittent fasting schedule (eat within an 8-hour window, fast for 16) for at least 8 weeks. This approach may yield better weight loss and metabolic improvements than simply counting calories, and it is generally well-tolerated.

Weight loss is the primary therapy for NAFLD, improving liver biochemistry, histology, and insulin sensitivity.

Lose weight through diet and exercise. This is the most effective way to improve liver health in NAFLD patients, even without medication.

Bariatric and metabolic surgery leads to resolution of NAFLD/NASH in the majority of patients and regression of liver fibrosis.

For eligible patients, bariatric surgery is a highly effective treatment that can resolve NAFLD and reverse liver fibrosis.

Habitual consumption of sugar-sweetened beverages (SSBs) causes weight gain and increases the risk of type 2 diabetes, cardiovascular disease, and all-cause mortality.

To prevent age-related weight gain and reduce chronic disease risk, limit or eliminate sugar-sweetened beverages. Replacing SSBs with non-caloric options (water, unsweetened tea/coffee) has been shown to reduce body weight, particularly in individuals with overweight or obesity. Be aware that liquid calories from soda do not make you feel full, so you are likely to consume these calories on top of your normal food intake.

Replacing SSBs with non-caloric beverages reduces body weight and BMI gain, especially in children and individuals with overweight or obesity.

If you want to lose weight or prevent weight gain, swap your sugary drinks for water or unsweetened alternatives. This is particularly effective if you have excess weight. You do not need to eliminate all sugar from your diet, but removing liquid sugar is one of the most impactful single changes you can make.

Lifestyle modifications, specifically weight loss of 5-10% combined with regular exercise (150 min moderate or 75 min vigorous per week) and a diet rich in fiber/low in saturated fats and high-glycemic carbohydrates, are the preferred first-line therapy for managing Polycystic Ovary Syndrome (PCOS) symptoms and restoring ovulation.

For PCOS management, prioritize lifestyle changes over medication initially. Aim to lose 5-10% of your body weight through calorie restriction and a diet high in fiber and low in saturated fats and high-glycemic carbs. Incorporate 150 minutes of moderate or 75 minutes of vigorous exercise weekly. This approach is clinically proven to restore regular menstruation and reduce metabolic risks.

Lifestyle interventions combining calorie restriction and moderate-intensity exercise are the primary recommended treatment for NAFLD, with weight loss of >7% body weight improving NASH histology and ~10% weight loss leading to fibrosis regression in 45% of patients.

Focus on losing 7-10% of your body weight through a combination of eating fewer calories and doing moderate exercise. This is the most effective way to improve liver health and potentially reverse fibrosis. Even if you don't lose all the weight, regular exercise alone can reduce liver fat.

Lifestyle interventions, specifically calorie-restricted diets combined with at least 150 minutes of weekly aerobic exercise, are the first-line treatment for improving insulin sensitivity in women with PCOS.

Start with lifestyle changes before medication. Focus on eating fewer calories and aiming for 150 minutes of aerobic exercise per week, ensuring at least 90 minutes are vigorous. Prioritize sleep and mental health, as these support metabolic health. If lifestyle changes are too difficult to sustain alone, consider adding insulin-sensitizing drugs like Metformin as a chronic treatment option.

Weight loss of 10% or more through lifestyle interventions (hypocaloric diet and exercise) is necessary to achieve regression of liver fibrosis in patients with NAFL/NASH.

To reverse liver scarring (fibrosis), you need to lose at least 10% of your body weight. This requires a daily calorie deficit of about 750 calories combined with 200 minutes of walking per week. While losing 3-5% helps fat and 5-7% helps inflammation, hitting that 10% mark is what actually reverses fibrosis. This is the most effective treatment available, but it is hard to maintain.

Caloric restriction in humans improves metabolic health by reducing visceral adipose tissue, intramyocellular lipid content, and inflammatory markers, although long-term insulin sensitivity benefits may diminish after two years.

Sustained caloric restriction can reduce visceral fat and inflammation. However, be aware that insulin sensitivity improvements may plateau after two years, and the effort required is high.

Lifestyle interventions, specifically caloric restriction and exercise, are the foundational first-line treatment for NAFLD, capable of inducing 5-10% weight loss and improving insulin resistance and hepatic steatosis.

Start with lifestyle changes as your primary treatment. Aim for a 5-10% reduction in body weight through a combination of a Mediterranean-style diet (high in plants, healthy fats) and regular exercise (both resistance and aerobic). This is the foundational step recommended by major guidelines before considering medications.

Adherence to a Mediterranean dietary pattern reduces the risk of developing MASLD by 23% compared to a Western dietary pattern.

Adopting a Mediterranean diet lowers your risk of MASLD by 23% compared to a Western diet. Focus on healthy fats, vegetables, and whole grains.

Calorie-restricted interventions (CRI) significantly reduce liver enzymes (ALT, AST), hepatic steatosis, and liver stiffness in NAFLD patients, with a dose-response relationship between the degree of calorie restriction and clinical benefit.

For NAFLD management, establishing a consistent calorie deficit is the most effective first-line strategy. This approach reliably lowers liver enzymes (ALT/AST), reduces liver fat, and improves liver stiffness. While specific diet types (like Mediterranean) also help, the degree of calorie restriction directly correlates with liver benefits, making energy balance the primary lever for treatment.