Browse the evidence

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.

Regular physical activity, specifically moderate aerobic activity (150-300 min/week) combined with strength training (2-3 times/week), is a critical factor for weight maintenance and maximizing weight loss after bariatric surgery.

To keep the weight off after surgery, make exercise a habit. Aim for at least 150 minutes of moderate aerobic activity (like brisk walking) each week, working up to 300 minutes if possible. Add strength training 2-3 times a week to build muscle. Start these activities as soon as your doctor says it's safe after your operation.

Lifestyle changes, specifically weight reduction and physical exercise, are the first-line approach for overweight and obese men with functional hypogonadism because weight loss can increase testosterone concentrations.

If you are overweight or obese and have low testosterone, lose weight and exercise before starting testosterone therapy. Weight loss can naturally raise your testosterone levels. This is the recommended first step.

Metabolic and fitness adaptations gained from exercise are rapidly lost within days to weeks of inactivity, but can be restored upon resuming normal activity.

If you stop exercising, you will lose your fitness quickly. However, when you start exercising again, your fitness will return to where it was. Try to maintain some level of activity to avoid the loss.

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.

Reallocating time from sedentary behavior to moderate-to-vigorous physical activity (MVPA) significantly reduces all-cause mortality risk, with the magnitude of benefit increasing as the intensity of the substituted activity increases.

To lower your risk of death, prioritize replacing sitting time with moderate-to-vigorous activity (like brisk walking, jogging, or cycling) over light activity. The more intense the activity you swap in, the greater the mortality benefit. You do not need to find extra time; simply displace sedentary time with this higher-intensity movement.

Reallocating time from sedentary behavior to physical activity (both LPA and MVPA) is associated with reduced adiposity markers, including body mass index (BMI), body fat percentage, and waist circumference, with MVPA showing greater effects than LPA.

To reduce body fat and waist circumference, replace sitting time with physical activity. While moderate-to-vigorous activity (MVPA) offers the greatest benefit, even light physical activity (LPA) substitutions can help reduce BMI and body fat percentage across all age groups.

Weight loss of 5% or more induces histological resolution of non-alcoholic steatohepatitis (NASH), while weight loss of 10% or more promotes fibrosis regression.

To reverse liver inflammation (NASH), aim to lose 5% of your body weight. To reverse liver scarring (fibrosis), aim for 10% weight loss. This is best achieved through a combination of dietary changes and exercise, supported by professional guidance (dietician) and tools (apps/support groups).

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.

Ketogenic diets result in significantly greater weight loss and improvements in metabolic markers (insulin, HbA1c) compared to standard low-fat or non-ketogenic calorie-restricted diets in overweight or obese individuals, particularly those with type 2 diabetes.

If you are overweight or have Type 2 Diabetes, a ketogenic diet (very low carb, moderate protein, high fat) is likely to produce faster and more significant weight loss and metabolic improvements than a standard low-fat diet. This is driven by lower insulin levels, which allows your body to access fat stores more easily.

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.

Engaging in any physical activity before pregnancy is associated with a 30% reduction in the odds of developing gestational diabetes mellitus (GDM) compared to no activity.

If you are planning to get pregnant, start moving now. You do not need to be an athlete; any regular physical activity before conception can lower your risk of gestational diabetes by about 30% compared to being sedentary. Focus on consistency rather than intensity.

Higher consumption of sugar-sweetened beverages (SSBs) is positively associated with increased body weight and BMI in both children and adults, based on prospective cohort studies and randomized controlled trials.

To manage weight, reduce or eliminate sugar-sweetened beverages. The evidence shows a consistent positive link between SSB intake and weight gain/BMI in both children and adults. Replacing SSBs with water or other non-caloric beverages is a recommended public health strategy.

Consuming home-cooked meals more than five times per week is associated with a lower likelihood of having an overweight BMI and excess body fat, independent of dietary quality improvements.

Eat home-cooked main meals more than five times a week. This habit is linked to a significantly lower likelihood of being overweight or having excess body fat, even when accounting for the nutritional quality of the food itself.

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.

Excessive gestational weight gain (GWG) in women with GDM increases the risk of adverse outcomes including hypertensive disorders, cesarean section, and large for gestational age (LGA) babies, and calorie restriction (30-33%) may be necessary for obese women who have already reached recommended weight gain.

If you are obese and have GDM, monitor your weight gain closely. If you reach the recommended limit, you may need to stabilize your weight with a moderate calorie reduction (30-33%) to improve blood sugar and reduce risks.

Total energy expenditure (volume) is a stronger predictor of improvements in exercise capacity and health parameters than exercise intensity alone; therefore, prescribing exercise based on total energy expenditure is more effective than focusing solely on intensity.

Don't obsess over how hard you are working; focus on how much total work you are doing. Whether you walk briskly for 60 minutes or jog for 30 minutes, if the total energy burned is similar, your heart health benefits will be similar. Aim for 1000-2000 kcal of exercise per week, spread across several days. If you are short on time, higher intensity might help you reach that volume faster, but it is not strictly required if you can exercise longer.

Intermittent energy restriction (2 days/week of 500-600 kcal) is clinically equivalent to continuous energy restriction (1200-1500 kcal/day) for improving glycemic control (HbA1c) in patients with type 2 diabetes over 12 months.

If you have type 2 diabetes, eating very little (500-600 calories) on just two days a week can lower your blood sugar (HbA1c) just as effectively as eating less every single day. However, you must work with your doctor to adjust diabetes medications, especially insulin or sulfonylureas, to avoid low blood sugar, particularly in the first few weeks.

Low energy availability (EA), defined as inadequate energy intake relative to exercise energy expenditure, is the primary trigger for Relative Energy Deficiency in Sport (RED-S), leading to compromised physiological processes including menstrual dysfunction, bone stress injuries, and impaired sports performance.

If you are an athlete training hard, you must eat enough to cover your exercise energy expenditure plus your body's basic needs. If you consistently eat less than this, you risk menstrual dysfunction, bone stress injuries, and lower performance. Do not rely on feeling 'fine'; use validated screening tools like the LEAF-Q if you are female, and consult a sports dietitian to ensure your energy intake matches your training load.

Moderate to vigorous physical activity attenuates the obesity risk associated with the FTO gene risk alleles, reducing the effect size by approximately 30% in adults.

If you carry the FTO risk gene, regular moderate-to-vigorous physical activity is your most powerful tool. It can reduce your genetic risk for obesity by about 30%. You do not need to be an elite athlete; consistent activity is sufficient to counteract this specific genetic predisposition.

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.

Short sleep duration (defined as <7 hours per night) is consistently associated with an increased risk of developing obesity and type 2 diabetes mellitus (T2DM) in adults and children, with a dose-response relationship where shorter sleep correlates with higher risk.

Aim for 7-8 hours of sleep per night. Consistently getting less than 7 hours is a significant risk factor for gaining weight and developing type 2 diabetes. This is not just about feeling tired; it affects your body's energy balance and insulin sensitivity. Protecting your sleep duration is as critical for metabolic health as your diet and exercise habits.

Adopting a flexitarian or semi-vegetarian diet (SVD) is associated with lower body weight, reduced BMI, and lower body fat percentage compared to non-vegetarian diets.

If you want to lose weight or improve metabolic health, you don't need to go fully vegan. Adopting a flexitarian diet—where you eat meat occasionally (e.g., less than once a week) or exclude red meat but eat poultry/fish—is associated with lower BMI and body fat compared to standard non-vegetarian diets. Focus on reducing red and processed meats while increasing plant-based foods.

Reduction in body weight is an independent determinant of reduced intrahepatic lipid in patients with T2DM and NAFLD, regardless of the specific antidiabetic agent used.

Losing weight is the key to reducing liver fat, regardless of whether you use a GLP-1, a DPP-4 inhibitor, or lifestyle changes. The drug helps you lose weight, and the weight loss reduces the liver fat.