Browse the evidence

A 3-month low-calorie lacto-ovo vegetarian diet and a low-calorie Mediterranean diet produce equivalent reductions in body weight, BMI, and fat mass in overweight omnivores.

If you are overweight and want to lose weight, both a low-calorie vegetarian diet (including eggs and dairy) and a low-calorie Mediterranean diet will work equally well over 3 months. The key is the caloric deficit, not the specific exclusion of animal products, provided you follow a structured plan.

Weight loss reverses the metabolic and autonomic alterations associated with obesity, including sympathetic overactivity.

Achieving weight loss is not just about reducing mass; it actively reverses the harmful nervous system adaptations (like high sympathetic tone) that contribute to heart disease risk in obesity.

High carbohydrate (CHO) availability before, during, and after exercise improves endurance performance by delaying glycogen depletion and maintaining high rates of CHO oxidation.

If you are training or competing for more than 90 minutes, prioritize high carbohydrate intake before, during, and after your sessions. This strategy is proven to improve performance by 2-3% in time trials and increase capacity by ~20% by ensuring your muscles have enough glycogen to sustain high-intensity effort without fatiguing early.

Aerobic exercise training significantly improves body composition, cardiovascular health, and metabolic profiles in patients with metabolic syndrome, with isolated aerobic exercise appearing optimal for reducing fat mass and body mass.

If you have metabolic syndrome, engaging in aerobic exercise for at least 12 weeks is a highly effective strategy to improve your health. You can expect improvements in your weight, waist size, blood pressure, blood sugar, and cholesterol levels. You do not necessarily need to combine this with resistance training to see these benefits, as aerobic exercise alone is sufficient and optimal for many of these outcomes. Aim for moderate to high intensity aerobic activity, but consistency over 12+ weeks is key.

Maximal fat oxidation (MFO) occurs at exercise intensities between 45% and 65% of VO2max, with rates ranging from 0.17 to 1.27 g/min in trained individuals, and can exceed 1.5 g/min in ketogenic-adapted individuals.

To maximize the amount of fat your body burns per minute, exercise at a moderate intensity, specifically between 45% and 65% of your maximum heart rate capacity (VO2max). If you are adapted to a ketogenic diet, you may achieve even higher fat oxidation rates, but for most people, staying in this moderate zone is key for maximizing fat burning efficiency.

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.

Objectively measured light-intensity physical activity (LPA) is inversely associated with all-cause mortality and favorably associated with cardiometabolic risk factors (waist circumference, triglycerides, insulin, metabolic syndrome) in adults, even after adjusting for moderate-to-vigorous physical activity (MVPA).

Incorporate more light movement into your daily routine. This includes activities like slow walking, standing, or light household chores. While vigorous exercise is important, adding light activity throughout the day provides independent health benefits, particularly for heart health and longevity, regardless of how much intense exercise you do.

Dietary nitrate supplementation (e.g., beetroot juice) improves oxygen uptake kinetics and reduces the O2 cost of submaximal exercise, leading to performance improvements in time-to-exhaustion tasks (4-25%) and intermittent team-sport exercises (3-5%).

Consume 310-560mg of nitrate (typically via beetroot juice) 2-3 hours before your event. This improves efficiency and can boost performance by 3-5% in team sports or up to 25% in time-to-exhaustion tasks. It may take 3+ days of consistent intake for cumulative benefits.

Beta-alanine supplementation (3.2-6.4 g/day for 2-12 weeks) increases muscle carnosine levels and improves performance in high-intensity exercise lasting 30 seconds to 10 minutes.

Take 3.2-6.4g of beta-alanine daily, split into smaller doses (e.g., 0.8-1.6g every 3-4 hours) to avoid tingling. Do this for at least 2-4 weeks (up to 12 weeks for max benefit). This will improve your performance in high-intensity efforts lasting 30 seconds to 10 minutes.

Weight loss of at least 10% is required to improve all features of NASH and stabilize or improve fibrosis, while a 5% loss stabilizes fibrosis.

To reverse NASH, aim for a 10% reduction in your total body weight. This level of loss has been shown to improve all features of the disease. If 10% feels unattainable, start with 5%, as this amount is sufficient to stabilize or improve liver fibrosis, preventing progression to cirrhosis. Combine this caloric deficit with increased physical activity and consider a Mediterranean diet for additional hepatic benefits.

Very low energy diets (VLED) and formula meal replacements produce significantly greater weight loss in adults with type 2 diabetes compared to standard low-energy or low-fat diets.

If you have type 2 diabetes and want maximum weight loss, using a structured Very Low Energy Diet (400-500 kcal/day) or formula meal replacements for 8-12 weeks is more effective than standard low-fat or low-carb diets. This approach creates a larger caloric deficit than self-selected food diets, leading to roughly 6.6 kg more weight loss.

Interventions using a hypocaloric formula 'total diet replacement' induction phase are the most effective approach for achieving type 2 diabetes remission.

To maximize your chances of reversing type 2 diabetes, use a program that starts with a formula-based total diet replacement phase. This approach yields a 54% remission rate at one year, significantly higher than Mediterranean (15%) or ketogenic (20%) diets.

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.

Dynamic resistance training is safe and effective for patients with hypertension, provided the load is not too heavy and breath-holding is avoided.

If you have high blood pressure, you can safely do resistance training. Use moderate weights (enough to lift about 8 times), avoid holding your breath, and focus on smooth movements. This helps lower your blood pressure over time.

Weight loss, particularly through bariatric surgery or lifestyle interventions, significantly reduces ectopic fat in the liver, pancreas, and heart, improving metabolic health.

Significant weight loss, whether through diet, exercise, or surgery, is effective at reducing harmful fat deposits in organs, leading to improved metabolic health.

Combined reduced-calorie diet and aerobic exercise interventions significantly improve pregnancy rates in overweight and obese women seeking fertility treatment compared to standard care or no intervention.

If you are overweight or obese and trying to conceive, combining a reduced-calorie diet with aerobic exercise is the most effective non-surgical way to increase your chances of pregnancy. Focus on reducing fat and refined carbohydrates while increasing physical activity. Note that while this improves pregnancy rates, it does not necessarily reduce the risk of miscarriage.

For individuals with the same BMI, higher levels of physical activity are associated with a significantly lower body fat percentage, indicating that BMI alone does not fully capture adiposity differences driven by activity levels.

If you are physically active, you likely have less body fat than someone with the same BMI who is sedentary. Do not rely on BMI alone to assess your health or fat loss progress. Prioritize maintaining or increasing your physical activity (walking, moderate, and vigorous exercise) as it independently reduces body fat percentage, even if your total body weight remains stable.

Substituting low-calorie sweetened (LCS) beverages for sugar-sweetened beverages (SSBs) is an effective strategy to reduce energy intake and promote weight loss in adults, particularly habitual SSB consumers.

If you drink sugary sodas regularly, switching to diet or zero-sugar versions is a scientifically supported way to cut calories and lose weight. It works best if you use it to replace sugary drinks, not to add on top of them. If you have diabetes, this can help manage blood sugar spikes, but you should still prioritize water when possible.

In overweight or obese patients with type 2 diabetes, each kilogram of weight loss achieved through non-surgical interventions (diet or pharmacotherapy) results in a mean reduction of 0.1 percentage points in glycated hemoglobin (HbA1c).

For every kilogram (2.2 lbs) of body weight you lose, your HbA1c is expected to drop by 0.1 percentage points. This applies to overweight or obese adults with Type 2 Diabetes using diet or non-surgical drugs. The benefit is linear: more weight loss equals more HbA1c reduction. This holds true regardless of whether you use low-carb, low-fat, or pharmacological weight loss strategies, as long as weight is lost. Note: This model applies to non-surgical interventions over 3-24 months.

High levels of physical activity preserve mitochondrial capacity and exercise efficiency in older adults, effectively negating the negative impacts of chronological aging on these metrics.

If you are an older adult, maintaining a high level of physical activity, particularly endurance exercise, is crucial for preserving mitochondrial health. This preservation directly supports better muscle quality, exercise efficiency, and physical performance, effectively counteracting many negative effects typically associated with aging. Focus on staying active rather than accepting decline as inevitable.

Empagliflozin (10 mg/day) leads to significant reductions in body weight and visceral adipose tissue (VAT) area in patients with T2DM and NAFLD, whereas pioglitazone increases these metrics.

Empagliflozin (10 mg daily) not only helps control blood sugar but also significantly reduces body weight and visceral fat in patients with Type 2 Diabetes and fatty liver disease. This is in contrast to pioglitazone, which tends to increase weight and fat. This weight loss benefit supports liver health improvement.

Lifestyle modifications, specifically diet, physical exercise, and weight loss, are the primary effective therapeutic interventions for Non-Alcoholic Fatty Liver Disease (NAFLD) and Metabolic Syndrome (MS), as they directly improve insulin resistance and histological liver outcomes.

To treat fatty liver, you must change your lifestyle. There are no approved drugs that work as well as losing weight and moving more. Aim for a 7-10% reduction in body weight through a healthy diet (like the Mediterranean diet) and regular physical activity. This improves insulin resistance and reduces liver fat and inflammation.

Low Energy Availability (LEA), defined as energy availability < 30 kcal/kg fat-free mass (FFM) per day, causes detrimental physiological adaptations including endocrine suppression, reduced bone mineral density, and impaired performance in both male and female athletes.

Ensure your daily energy intake minus exercise expenditure is at least 30 kcal per kg of fat-free mass. If you are an athlete, especially in weight-sensitive sports, monitor for signs of LEA such as fatigue, menstrual irregularities (in females), or decreased performance. Consult with sports dietitians and medical professionals to adjust nutrition and training loads appropriately.

Very Low-Energy Diets (VLEDs, <800 kcal/d) produce significantly greater short-term weight loss than Low-Energy Diets (LEDs, 800-1800 kcal/d), but this advantage diminishes and becomes statistically non-significant after 12 months.

If you need rapid weight loss (e.g., for surgery or diabetes remission), a medically supervised Very Low-Energy Diet (<800 kcal) works faster than standard diets. However, do not expect this advantage to last beyond a year. The key is using VLED as a short-term tool (12-20 weeks) to achieve a significant initial loss, then carefully transitioning to a sustainable maintenance diet to keep the weight off.