Browse the evidence

High-load resistance training (>60% 1RM) is superior to low-load training for maximizing one-repetition maximum (1RM) strength gains, although significant strength gains can still be achieved with low loads if taken to failure.

To maximize your one-rep max, prioritize heavy loads (80-100% 1RM). However, if you cannot lift heavy due to injury or preference, you can still build substantial strength using lighter loads (below 60% 1RM) as long as you perform enough repetitions (15+) to reach muscular failure.

Increasing daily protein intake to ≥1.6 g/kg/day enhances lean body mass gains in healthy adults under 65 years old who perform resistance exercise, whereas older adults (≥65) achieve significant gains at lower intakes (1.2–1.59 g/kg/day).

If you are under 65 and lifting weights, aim for at least 1.6 grams of protein per kilogram of body weight daily to maximize muscle growth. If you are 65 or older, you may see significant muscle benefits with a slightly lower intake of 1.2 to 1.6 grams per kilogram. This assumes you are doing resistance exercise; protein alone without exercise has minimal impact on muscle mass in healthy adults.

A ketogenic diet (carbohydrate restriction <50g/day) promotes weight loss and visceral adiposity reduction by inducing nutritional ketosis, which suppresses appetite via beta-hydroxybutyrate (BHB) signaling and increases energy expenditure through fat oxidation.

To use this diet, restrict carbohydrates to under 50 grams per day (under 20g for therapeutic effects). Focus on healthy fats and moderate protein. Expect initial weight loss and reduced hunger due to ketone production. Monitor your progress with blood ketone levels (0.5-3.0 mmol/L) to ensure you are in ketosis.

Ketogenic diets improve glycemic control in Type 2 Diabetes patients by reducing carbohydrate intake, thereby lowering insulin levels and HbA1c, and reducing the need for insulin medication.

If you have Type 2 Diabetes, restricting carbs to under 30g/day can significantly lower your HbA1c and reduce your need for insulin. Work with your doctor to adjust medications as your blood sugar improves.

Frequent home cooking (≥7 dinners/week) is associated with higher overall diet quality (HEI-2015) compared to infrequent cooking (0-2 dinners/week), with the magnitude of benefit being significantly stronger in higher-income adults than in lower-income adults.

Cooking dinner at home more often, specifically aiming for 7 times a week, is linked to better diet quality. However, if you have a lower income, simply cooking more often may not significantly improve your diet quality unless you also have access to affordable, healthy ingredients. Focus on accessible healthy options like frozen vegetables to bridge the gap between cost and nutrition.

Tirzepatide, a dual GIP/GLP-1 receptor agonist, significantly reduces body weight (exceeding 20% in some contexts) and improves glycemic control (HbA1c) in patients with Type 2 Diabetes and Obesity when administered via subcutaneous injection once weekly.

Tirzepatide is a once-weekly subcutaneous injection approved for Type 2 Diabetes and Obesity. It works by mimicking two gut hormones (GLP-1 and GIP) to improve insulin sensitivity and reduce appetite. Clinical trials show it leads to significant weight loss (often >20%) and better blood sugar control than some existing drugs like semaglutide. Common side effects like nausea are usually temporary and managed by starting with a low dose and increasing slowly. It is not a standalone cure but works best with lifestyle changes.

Adherence to Mediterranean and high-quality dietary patterns significantly reduces the risk of cardiovascular disease (CVD), coronary heart disease (CHD), and stroke, whereas low-salt and low-total-fat diets do not show significant preventive benefits in randomized controlled trials.

Adopt a Mediterranean-style or high-quality dietary pattern to significantly lower your risk of heart disease and stroke. This involves eating more vegetables, fruits, nuts, legumes, and healthy fats (like olive oil), while minimizing processed foods and trans fats. Do not rely solely on low-salt or low-fat diets, as evidence does not support them as effective standalone preventive measures.

Using taste-focused labels (emphasizing specific flavors and positive experiences) on vegetable dishes significantly increases vegetable selection and consumption compared to health-focused or basic labels.

When labeling healthy food, especially vegetables, describe the specific flavors, ingredients, and preparation methods (e.g., 'Roasted Garlic Broccoli') rather than just listing health benefits (e.g., 'High in Vitamin C'). This approach leverages the natural human preference for taste, making healthy choices more appealing and increasing the likelihood that people will select and consume them.

Consumption of sugar-sweetened beverages (SSBs) increases the risk of type 2 diabetes, obesity, and cardiovascular disease.

Stop drinking sugar-sweetened beverages. They are a major source of added sugar and increase your risk for heart disease and diabetes. Replace them with water, unsweetened tea, or sparkling water. If you need a sweet taste, low-calorie sweetened beverages are a better option than soda, but water is best.

Older adults require a per-meal protein dose of approximately 0.4 g/kg (or ≥30g of high-quality protein) to maximally stimulate muscle protein synthesis, which is higher than the threshold for younger adults.

If you are over 60, aim for at least 30 grams of high-quality protein (like meat, eggs, or whey) at every main meal. This specific amount is required to trigger maximum muscle building signals, which your body needs more of as you age compared to when you were younger.

Distributing protein intake evenly across meals (reaching the per-meal threshold) is more effective for muscle mass and function than skewing intake toward a single large meal, provided total daily protein is adequate.

Try to eat a similar amount of protein at breakfast, lunch, and dinner. Most older adults eat too little in the morning and too much at night. Spreading it out helps your body build and maintain muscle better than eating it all at once.

Supplemental protein intake of approximately 5 g/day significantly increases lean body mass, with a plateau in gains between 5-50 g/day and a linear increase in muscle mass for intakes exceeding 50 g/day.

To increase muscle mass, adding just ~5 grams of protein daily (e.g., one egg or a cup of milk) can be effective, even without exercise. If you are engaging in resistance training or seeking maximal hypertrophy, increasing supplemental protein beyond 50 grams per day may continue to drive linear increases in lean body mass. This applies to diverse populations, including the elderly and those without serious illness.

Substituting saturated fats and trans fats with unsaturated fats (MUFA and PUFA) reduces total mortality, whereas substituting carbohydrates with saturated or trans fats increases mortality.

Focus on the quality of your macronutrients. Replace saturated and trans fats with unsaturated fats (nuts, olive oil, fish). Avoid replacing carbohydrates with animal fats; instead, choose unsaturated fats or plant-based proteins if reducing carbs.

Combining a five-ingredient nutritional supplement (whey, casein, creatine, vitamin D, omega-3) with home-based resistance exercise significantly improves lean mass, strength, and muscle quality in free-living elderly men compared to exercise with a placebo.

For elderly men looking to maintain or build muscle, combining daily intake of a specific multi-ingredient supplement (containing protein, creatine, vitamin D, and omega-3s) with home-based resistance band training (3 days a week) is an effective strategy. This approach improves lean mass, strength, and physical function, particularly for those who are sedentary or have sarcopenia. The key is consistency in both supplementation and progressive resistance exercise.

A caloric deficit of 500–750 kcal/day is the primary driver of weight loss in patients with diabetes, whereas exercise alone is insufficient for initial loss but critical for maintenance.

To lose weight, you must eat less. Focus on creating a daily calorie deficit of 500-750 calories. Do not rely on exercise alone to drop the weight initially, as diet is far more effective for that. Once you have lost the weight, use exercise (150 minutes of moderate activity and resistance training twice a week) to keep it off. If you take insulin, check your blood sugar often when you start eating less to avoid dangerous lows.

GLP-1 receptor agonists and SGLT2 inhibitors are preferred glucose-lowering medications for obese diabetic patients because they promote weight loss (5.3 kg and 2.4 kg respectively), whereas sulfonylureas, TZDs, and insulin promote weight gain.

If you are taking diabetes medication and struggling with weight, ask your doctor about switching to GLP-1 agonists (like semaglutide or liraglutide) or SGLT2 inhibitors (like empagliflozin), which help you lose weight. Avoid medications like insulin, sulfonylureas, or TZDs if possible, as they tend to cause weight gain.

Whey protein supplementation (35g) combined with resistance training increases skeletal muscle mass, muscular strength, and functional capacity in pre-conditioned older women, regardless of whether the protein is consumed immediately before or immediately after the training session.

If you are an older woman doing resistance training, adding 35 grams of whey protein on your training days will help you build muscle and strength. It does not matter if you drink it before or after your workout; just ensure you are getting it on the days you exercise. This strategy helps combat age-related muscle loss (sarcopenia) and improves daily functional ability.

High-intensity resistance training (HI-RT) combined with moderate protein supplementation significantly reverses sarcopenia (increases skeletal muscle mass and strength) in older men with osteosarcopenia, whereas protein supplementation alone is insufficient to maintain muscle mass and function.

If you are an older man with low muscle mass and weak bones, doing just one set of resistance exercises twice a week, pushing close to your limit, is highly effective. You must combine this with adequate protein (up to 1.5g per kg of body weight) and Vitamin D. Simply taking protein without exercising will not stop muscle loss. This approach is safe, supervised, and efficient, requiring only about 50 minutes per session.

In individuals with high central adiposity (high trunk fat), replacing sugar-sweetened beverages with either unsweetened beverages or artificially sweetened beverages leads to greater weight loss compared to continuing to consume sugar-sweetened beverages.

If you carry extra weight around your stomach, switching your daily sugary drinks to water or diet soda can help you lose weight or prevent weight gain over a year. This benefit is specific to those with higher belly fat; if you are lean, you might not see a weight change, but you also won't gain weight from the switch.

Replacing sugar-sweetened beverages with unsweetened beverages (USBs) reduces sweet taste preference (threshold and favorite concentration) more effectively than replacing them with artificially sweetened beverages (ASBs).

If your goal is to reduce your craving for sweet tastes, switching from sugary drinks to water is more effective than switching to diet soda. Over a year, water drinkers significantly lowered their preference for sweetness, while diet soda drinkers did not change their threshold for what tastes sweet.

Semaglutide 2.4 mg is a cost-effective treatment for obesity and overweight in the US, providing greater weight loss and QALYs than diet/exercise, no treatment, or other anti-obesity medications, provided the willingness-to-pay threshold is $150,000 per QALY.

For patients with obesity or overweight plus comorbidities, semaglutide 2.4 mg combined with diet and exercise is a cost-effective medical option in the US, offering significant weight loss and quality-adjusted life years compared to lifestyle changes alone or other medications, assuming a willingness-to-pay threshold of $150,000 per QALY.

Higher total daily protein intake (1.2–1.5 g/kg body weight) mitigates age-related muscle loss in older adults, and when this higher intake is achieved, the specific source of protein (animal vs. plant) has no significant differential effect on muscle mass or strength gains.

If you are an older adult trying to maintain or build muscle, focus on hitting 1.2 to 1.5 grams of protein per kilogram of body weight every day. You do not need to buy expensive whey protein supplements. Plant-based proteins like soy or pea work just as well as animal proteins, provided you eat enough of them (typically >30 grams per meal) to trigger muscle growth. If you have severe kidney disease, consult a doctor before increasing protein.

Bodybuilders should consume 1.6–2.2 g of protein per kg of body weight daily, distributed in doses of 0.40–0.55 g/kg per meal across 3–6 meals.

Eat 1.6 to 2.2 grams of protein for every kilogram of your body weight each day. Split this total into 3 to 6 meals, aiming for roughly 0.4 to 0.55 grams per kilogram per meal. This ensures you hit the leucine threshold for muscle growth in each feeding without overconsumption.

Creatine monohydrate (3-5 g/day), caffeine (5-6 mg/kg pre-exercise), beta-alanine (3-5 g/day), and citrulline malate (8 g/day) may yield ergogenic effects beneficial for bodybuilders.

Consider creatine (3-5g daily) and caffeine (5-6mg/kg before training) for proven performance benefits. Beta-alanine and citrulline may help depending on your specific training goals, but prioritize food and training first.