Browse the evidence

In trained males, performing resistance training 3 days per week yields equivalent muscle strength and hypertrophy gains to performing it 6 days per week, provided total weekly training volume is equated.

If you are an experienced lifter, you do not need to train 6 days a week to maximize your muscle growth or strength. As long as you are performing the same total number of sets per muscle group per week, splitting those sets across 3 days will yield the same results as splitting them across 6 days. Focus on recovering well and hitting your volume targets rather than maximizing gym days.

Creatine supplementation increases fat-free mass (FFM) and lean body mass (LBM) only when combined with resistance training (RT); it produces no significant lean mass gains in non-resistance training contexts.

If your goal is to increase muscle mass, you must lift weights. Creatine will help you gain about 3.4 kg of lean mass if you train, but it will not build muscle if you only take the supplement without resistance exercise.

Combined lifestyle interventions integrating both dietary changes and structured exercise produce greater improvements in diabetes management (weight loss, glycemic control, cardiovascular risk) than either intervention alone.

Do not choose between diet and exercise; do both. Work with a healthcare provider to create a personalized plan that includes a balanced diet and at least 150 minutes of weekly exercise. This combination offers the best protection against complications and medication dependence.

Optimal combined SPAN behaviors (high sleep 8.0-9.4h, high MVPA 42-104min, high diet quality 57.5-72.5) are associated with a 57% lower risk of MACE compared to the lowest tertile of all behaviors.

To maximize cardiovascular protection, aim for 8-9.5 hours of sleep, 42-104 minutes of moderate-to-vigorous exercise daily, and a high-quality diet (score 32.5-50.0). This combination is associated with a 57% lower risk of major cardiovascular events compared to having low levels of all three behaviors.

Metabolic bariatric surgery (MBS) provides superior long-term weight loss and glycemic control compared to non-surgical management in patients with obesity and type 2 diabetes.

For patients with severe obesity and type 2 diabetes, metabolic bariatric surgery offers significantly better long-term weight loss and blood sugar control than non-surgical management. While surgery is not for everyone, those who undergo it maintain much greater weight loss (22% vs 8.6%) and better glycemic control over five years. If surgery is not an option, intensive lifestyle modification and pharmacotherapy are critical alternatives to mitigate health risks.

Obesity treatments (lifestyle, medications, surgery) improve obesity-related diseases, physical health-related quality of life (HrQoL), and body image, with the magnitude of benefit often correlating with the amount of weight loss.

Know that your treatment will likely improve your health conditions, energy, and how you feel about your body, even if weight loss is slow. Different treatments offer different benefits; for example, surgery and newer medications often provide greater health gains than lifestyle changes alone. Discuss with your provider which treatment best addresses your specific health concerns, such as heart disease or joint pain.

Combined aerobic and resistance exercise with a caloric deficit reduces knee pain incidence and improves physical function in overweight adults with chronic pain.

If you have chronic joint pain and are overweight, start with low-impact aerobic activity (like walking or cycling) for 150 minutes a week and add two days of light strength training. Combine this with a modest calorie reduction (500-1000 calories less per day). Increase intensity slowly only if your pain allows, focusing on consistency over intensity to rebuild joint stability and reduce inflammation.

Mediterranean and plant-forward dietary patterns improve glycemic control and reduce type 2 diabetes risk more effectively than rigid single-nutrient prescriptions.

Adopt a Mediterranean or plant-forward eating style focusing on whole foods, fiber, and unsaturated fats. Avoid rigid 'diet' labels; prioritize long-term sustainability and individual metabolic response over short-term restriction.

Adequate fruit and vegetable intake (>5 days/week meeting ≥100g/day threshold) and a balanced meat-vegetable diet are protective against stroke, reducing risk by approximately 41-57% compared to low intake or vegan diets.

Eat more fruits and vegetables daily (aim for >100g each) and maintain a balanced diet that includes moderate amounts of meat. This combination is strongly associated with a significantly lower risk of stroke compared to low intake or strict vegan diets. Focus on variety and balance rather than extreme restriction.

High consumption of ultra-processed foods is associated with increased risks of obesity, type 2 diabetes, and cardiovascular disease, independent of nutrient profile.

Reduce your intake of ultra-processed foods (items with industrial ingredients, additives, or intense processing) by focusing on whole, minimally processed foods. This shift is supported by strong evidence to lower your risk of obesity, diabetes, and heart disease.

Adherence to a healthful plant-based diet (high in whole grains, fruits, vegetables, nuts, legumes, and vegetable oils) is associated with a significantly lower risk of frailty in older women, whereas adherence to an unhealthful plant-based diet (high in refined grains, potatoes, sugar-sweetened beverages, and sweets) is associated with a higher risk.

To reduce the risk of frailty as you age, focus on the quality of your plant-based foods. Prioritize whole grains, fruits, vegetables, nuts, legumes, and vegetable oils. Limit refined grains, potatoes, sugary drinks, and sweets. You do not need animal products to maintain muscle and bone health; a well-planned diet rich in these healthy plant foods is associated with a significantly lower risk of frailty.

Anti-obesity medications (specifically GLP-1 agonists like Semaglutide and Liraglutide) facilitate significant weight loss in obese osteoarthritis (OA) patients, which reduces joint compressive forces and systemic inflammation, thereby alleviating pain and slowing structural progression.

For obese patients with knee OA, anti-obesity medications like Semaglutide (2.4 mg weekly) or Liraglutide (3.0 mg daily) are effective medical tools to achieve significant weight loss (up to 10-15% with other drugs, ~5-6kg with GLP-1s). This weight loss directly reduces the mechanical load on knees and lowers inflammatory markers, slowing OA progression. These drugs should be used as adjuncts to lifestyle changes, not replacements, and require long-term adherence as obesity is a chronic disease.

High-Intensity Interval Training (HIIT) or Sprint Interval Training (SIT) is more effective than moderate-intensity continuous training (MICT) for inducing specific metabolic adaptations (such as PGC1-α, NRF1, TFAM) in individuals who do not respond to moderate-intensity training.

If moderate exercise (like jogging at a conversational pace) hasn't improved your fitness, try adding high-intensity intervals. This type of training triggers different metabolic pathways (like mitochondrial biogenesis) that moderate exercise might miss, especially if you are genetically predisposed to be a 'low responder' to steady-state cardio.

Creatine monohydrate supplementation (loading then maintenance) significantly improves spike and block jump performance in elite volleyball players.

Consider a 4-week creatine loading protocol (5g daily after an initial loading phase) to potentially improve your vertical jump and blocking efficiency. This is one of the most researched and effective supplements for power sports.

Isocaloric substitution of ultra-processed foods (NOVA 4) with minimally processed foods and culinary ingredients (NOVA 1+2) is associated with greater weight loss, body fat reduction, and trunk fat reduction in individuals following an energy-restricted diet.

If you are trying to lose weight, focus on swapping ultra-processed foods (like packaged snacks, sugary drinks, and processed meats) for minimally processed foods (like whole fruits, vegetables, and whole grains) while keeping your total calories the same. This swap can help you lose more weight and body fat than just counting calories alone.

Maintaining high cardiovascular health (defined by the AHA's Life's Simple 7 metrics: smoking status, physical activity, weight, diet, blood glucose, cholesterol, and blood pressure) is associated with a significant reduction in major cardiovascular disease events, with 70% of events attributable to low/moderate health and 2 million events potentially preventable annually if all US adults attained high health.

Focus on the 'Life's Simple 7': stop smoking, stay active, maintain a healthy weight, eat a heart-healthy diet, and keep your blood pressure, cholesterol, and blood sugar in check. You don't need to be perfect; moving from poor to moderate health on these metrics significantly lowers your risk of heart disease and stroke.

Combining supervised exercise with GLP-1 receptor agonist (liraglutide) during weight loss maintenance significantly improves the sustainability of weight loss and body composition one year after treatment termination compared to using GLP-1 receptor agonist alone.

If you are using GLP-1 medications (like liraglutide or semaglutide) for weight loss, do not rely on the medication alone for long-term maintenance. The study shows that stopping the medication leads to significant weight regain. To prevent this, you must incorporate supervised exercise (specifically vigorous cycling and circuit training) during your treatment phase. This combination builds the behavioral and physiological resilience needed to maintain your weight loss even after you stop the medication.

Resistance training load (intensity) and weekly frequency impact muscular strength gains, whereas volume (number of sets) influences both strength and hypertrophy.

To maximize strength, prioritize higher loads and higher training frequencies. To maximize muscle size, prioritize higher training volumes (more sets per muscle group). These variables are distinct drivers for different adaptations.

Excessive consumption of free sugars, particularly from sugar-sweetened beverages (SSBs) and high-fructose corn syrup, negatively impacts human health by promoting obesity, type 2 diabetes, cardiovascular disease, and cognitive impairment through mechanisms like insulin resistance, de novo lipogenesis, and neuroinflammation.

To protect your metabolic and cognitive health, prioritize reducing free sugars, especially from sugar-sweetened beverages and high-fructose corn syrup. Aim for less than 5% of your daily calories from added sugars (approx. 25g for women, 36g for men, per AHA/WHO). Focus on whole food sources of carbohydrates (vegetables, whole grains, whole fruits) which provide fiber and nutrients, rather than isolated sugars. This helps mitigate risks of insulin resistance, liver fat accumulation, and cognitive decline.

Adequate sleep (7-9 hours nightly) is a critical lifestyle factor that decreases risks of insulin resistance, hypertension, hyperglycemia, dyslipidemia, and inflammation.

Prioritize getting 7-9 hours of sleep each night. Poor sleep directly worsens your blood sugar, blood pressure, and inflammation.

Weight reduction in individuals with obesity and obstructive sleep apnea (OSA) significantly reduces the Apnea-Hypopnea Index (AHI), with a 20% BMI reduction associated with a 57% AHI reduction, though the incremental benefit diminishes beyond this threshold.

If you have OSA and are overweight, losing weight is one of the most effective treatments available. Losing 20% of your body weight can reduce your sleep apnea severity by more than half. However, be aware that the biggest improvements happen in the first stages of weight loss; losing even more weight still helps, but the gains become smaller. Don't let the diminishing returns stop you—every bit of weight loss contributes to better sleep health.

Progressing resistance training by increasing repetitions while keeping load constant produces similar muscle hypertrophy and strength gains as progressing by increasing load while keeping repetitions constant over an 8-week period.

You do not need to add weight to the bar every week to keep building muscle. If you are stuck at a certain weight, focus on doing more repetitions with that same weight. As long as you are pushing close to failure, increasing your reps is just as effective for building muscle and strength as increasing the weight itself. This gives you a flexible way to progress, especially when you hit a plateau with adding weight.

Creatine supplementation combined with resistance training produces a small but statistically significant increase in regional skeletal muscle hypertrophy (measured by direct imaging like MRI/ultrasound) compared to resistance training alone.

If you are lifting weights, adding creatine (3-5g daily or 0.1g/kg) will likely help you build a small amount of extra muscle compared to lifting alone. The effect is small, not massive, but it is real and supported by direct imaging studies. It works for both young and older adults, though the benefit may be slightly larger in younger individuals.

Adherence to a Mediterranean diet reduces cardiometabolic risk by improving lipid profiles, lowering blood pressure, and enhancing insulin sensitivity.

Adopt a Mediterranean-style eating pattern by prioritizing plant-based foods, healthy fats like olive oil, and moderate protein from fish and poultry. This approach is linked to lower risks of heart disease and stroke. Focus on long-term adherence rather than strict calorie counting.