Browse the evidence

Current U.S. Recommended Dietary Allowance (RDA) for protein (0.8 g/kg/day) is likely insufficient for older adults, athletes, and pregnant/lactating women, as newer methodologies (IAAO) and functional outcome studies suggest higher intakes (1.2–2.6 g/kg/day) are required for optimal health and physical function.

If you are over 65, an athlete, or pregnant, aim for more protein than the standard 0.8g/kg. Target 1.2-1.6g/kg for older adults to protect muscle, and up to 1.6-2.0g/kg for athletes. Distribute this protein evenly across meals to maximize muscle synthesis.

Whey protein supplementation significantly increases appendicular skeletal muscle mass index and gait speed in older adults with sarcopenia compared to placebo or routine consultation.

If you are an older adult diagnosed with sarcopenia, adding whey protein supplements to your diet can help increase your muscle mass and improve your walking speed. You do not necessarily need to combine this with resistance training to see benefits in muscle mass and gait speed, though training may offer additional strength benefits. Aim for 9.6 to 40 grams of whey protein per serving, taken 1-3 times daily, over a period of at least 8 weeks.

Whey protein supplementation (60g/day) combined with resistance exercise significantly increases muscle mass and selective muscular strength/endurance compared to placebo, even when total caloric and macronutrient intake from meals is strictly controlled.

If you are doing resistance training, adding 60g of whey protein daily (split into 3 doses) can help you build more muscle and strength than training and eating a controlled diet alone. This benefit exists even if you are already eating enough calories and protein from your regular meals, suggesting the specific properties of whey (fast absorption, high essential amino acids) provide an extra edge.

Improving adherence to DASH or Healthy Eating Index (HEI) dietary patterns in young adults (ages 17-22) significantly reduces the risk of developing prediabetes or type 2 diabetes over a 4-year period.

If you are in your late teens or early twenties, focusing on improving your overall diet quality—specifically by following DASH or HEI guidelines—can significantly lower your risk of developing prediabetes. You don't need a perfect diet; even small, consistent improvements in your score (like eating more vegetables, whole grains, and less sodium/sugar) over a few years can reduce your risk of prediabetes by up to 64% if you improve your DASH score. This is a critical window to establish healthy habits before metabolic issues become entrenched.

High-protein diets promote long-term weight loss and prevent weight regain by increasing satiety, enhancing metabolic rate, and altering gut microbiota to favor beneficial species (Akkermansia, Bifidobacterium), while also upregulating tight junction proteins like occludin and ZO-1.

Increasing protein intake to about 18% of your daily calories can help you lose weight, keep it off, and strengthen your gut barrier. It changes your gut bacteria to be healthier and increases satiety. If you have kidney issues, talk to a doctor first.

Indoor team sport athletes (volleyball, basketball, handball, futsal) consistently fail to meet official nutritional recommendations, specifically exhibiting significant under-consumption of energy and carbohydrates alongside over-consumption of fats.

If you play indoor team sports, you are likely eating too much fat and not enough carbs or total calories, even if you feel you are eating 'healthy'. To optimize performance, you must prioritize carbohydrate intake to match your high-intensity demands and ensure total energy intake meets your expenditure to preserve muscle mass.

A daily protein intake of 1.6 g/kg body weight is sufficient to maximize gains in lean mass, muscle strength, and performance during both resistance training and concurrent training in healthy, resistance-trained males, with no additional benefit observed at 3.2 g/kg.

If you are a healthy male who lifts weights regularly, aim for 1.6 grams of protein per kilogram of body weight every day. Spread this out over 4-7 meals, ensuring each meal has 20-40 grams of protein. You do not need to eat double that amount (3.2 g/kg) to get bigger or stronger; studies show it offers no extra benefit for muscle growth or strength, though it might slightly help peak power in pure strength training. Stick to 1.6 g/kg, train consistently, and you will maximize your results without unnecessary digestive stress or excess calories.

High-quality protein-based multi-ingredient supplementation (MIS) containing whey/casein, creatine, vitamin D, calcium, and fish oil significantly mitigates anabolic resistance in obese older adults, whereas low-quality protein (collagen) fails to support lean mass or strength gains despite matching total protein intake.

For older adults with excess body fat, simply eating enough protein is not enough to build muscle. You need high-quality protein sources (whey/casein) that are rich in leucine and essential amino acids. Combining this with creatine, vitamin D, and omega-3s is significantly more effective than using low-quality proteins like collagen, even if the total protein grams are the same.

Mediterranean and Vegetarian diets are effective for weight loss and cardiovascular risk reduction, with Vegetarian diets potentially lowering LDL cholesterol more effectively and Mediterranean diets lowering triglycerides more significantly.

Both Mediterranean and Vegetarian diets are effective for weight loss and heart health. If your main concern is high LDL cholesterol, a Vegetarian diet may be slightly more effective. If you are focused on lowering triglycerides, the Mediterranean diet may offer a greater benefit. Choose the one you can sustain.

Consumption of hyperprocessed foods contributes to the epidemic of obesity, diabetes, and cardiovascular disease, with risk increasing proportionally to consumption levels.

Minimize the intake of hyperprocessed foods, defined as industrial formulations with five or more ingredients. Focus on whole or minimally processed foods. Reducing consumption of these items is directly linked to lower risks of diabetes and cardiovascular disease.

Daily protein supplementation (12g additional protein via skimmed milk/soy isolate) combined with simple calisthenic and aerobic exercise for 8 weeks significantly increases lean mass and appendicular muscle mass in healthy sedentary adults.

If you are sedentary and want to build muscle, you don't need a gym membership or expensive gear. Add 12g of protein daily (e.g., via a supplement or food) and perform simple bodyweight exercises (like squats and push-ups) 3 times a week, plus walk 150 minutes a week. Doing this for 8 weeks will likely increase your lean muscle mass.

A combined high-protein (25% energy) and low-glycemic-index (LGI) diet is superior to low-protein/high-GI diets for maintaining weight loss and improving insulin resistance (measured by TyG index) after an initial energy-restricted weight loss.

If you have recently lost weight, switch to a maintenance diet that is high in protein (around 25% of calories) and low in glycemic index (low-GI carbs). This specific combination helps you keep the weight off longer and improves insulin sensitivity better than diets low in protein or high in glycemic index. You do not need to count calories strictly; focus on the quality of your protein and carbohydrate sources.

Adopting a low-carbohydrate (LC) or very low-carbohydrate ketogenic (VLCK) diet (defined as <50g, 50-100g, or 101-150g carbohydrates per day) improves glycemic control and facilitates the deprescribing of antihyperglycemic medications in patients with Type 2 Diabetes Mellitus (T2DM).

If you have Type 2 Diabetes, reducing your daily carbohydrate intake to under 150 grams (and potentially under 50 grams for ketosis) can significantly improve your blood sugar levels and allow you to reduce or stop diabetes medications. Work with your doctor to adjust your insulin and other drugs to prevent low blood sugar, and ensure you are drinking enough water and getting electrolytes to avoid initial side effects like fatigue or cramps.

Type 2 Diabetes Mellitus can be put into remission (defined as HbA1c < 6.5% for ≥ 3 months without T2DM medications) through the use of therapeutic carbohydrate reduction and subsequent medication deprescription.

If you have Type 2 Diabetes, remission is possible. This means getting your blood sugar (HbA1c) below 6.5% for at least 3 months without taking diabetes medications. This is achieved by strictly limiting carbohydrates and working with your doctor to safely stop or reduce your diabetes drugs. It requires commitment to the diet and close monitoring.

Orlistat (120 mg twice daily) produces a statistically significant weight reduction (>2.9% vs placebo) and improves cardiovascular risk factors in obese patients, including those with type 2 diabetes.

Orlistat is an approved option for weight loss that works by blocking fat absorption. To maximize results and minimize stomach issues, take 120mg twice daily with meals containing fat, but keep your overall fat intake moderate. You must also take vitamin supplements (A, D, E) separately from the drug to avoid deficiencies.

High-protein diets (>25% of calories or 1-1.2 g/kg body weight) are superior to other macronutrient compositions for long-term weight maintenance, primarily by preserving fat-free mass and increasing satiety.

To keep weight off, prioritize protein in your diet (aim for 1-1.2 grams per kg of your goal body weight). This helps you feel full and protects your muscles, making it easier to stick to your weight loss goals long-term.

Orlistat, taken at 120 mg three times daily, reduces body weight by 8% over 12 months compared to 5% with placebo, and significantly reduces cardiovascular risk factors like hypertension and LDL cholesterol.

Orlistat (120 mg, 3 times daily) helps you lose about 8% of your body weight over a year by blocking fat absorption. It also lowers blood pressure and LDL cholesterol. You must follow a low-fat diet and take vitamin supplements to avoid side effects like oily stools.

Anti-obesity medications (AOMs) cause disproportionate loss of lean mass (skeletal muscle), which may worsen frailty and functional capacity in heart failure patients, necessitating concurrent resistance training and protein intake.

When using GLP-1 or GLP-1/GIP medications for heart failure, be aware that you will lose muscle mass along with fat. To protect your strength and function, you MUST combine these medications with resistance training and ensure adequate protein intake. Monitor your functional capacity closely.

Carbohydrate periodization and strategic timing (loading, intra-exercise intake, post-exercise recovery) significantly support performance and recovery, whereas excessive protein intake above recommendations does not further improve performance.

For events over 90 minutes, use carbohydrate loading (10-12g/kg) 36-48 hours prior. During exercise, consume 30-60g carbs/hour (up to 90g for >2.5h). Post-exercise, prioritize carbs (1.2g/kg) if recovery time is short. Do not exceed protein recommendations as it offers no extra performance benefit.

Adherence to a healthy vegan diet results in greater improvements in overall diet quality (HEI-2015) compared to a healthy omnivore diet, driven by higher intakes of fiber, legumes, and vegetables and lower intakes of added sugars and refined grains.

If you switch to a vegan diet, focus on increasing vegetables, legumes, nuts, seeds, and whole grains while reducing added sugars and refined grains. This study shows that a well-structured vegan diet can improve overall diet quality more than a healthy omnivore diet. Start with delivered meals or meal planning support to build skills, then transition to self-prepared meals. Ensure you monitor Vitamin B12 levels as intake drops without animal products.

Maintaining a higher proportional energy intake from protein (by limiting discretionary foods) is associated with lower total energy intake and better 12-month weight loss maintenance, whereas diluting protein with high fat/carbohydrate leads to increased energy intake and weight regain via the protein leverage mechanism.

To maintain weight loss, prioritize foods that keep your protein percentage high relative to fats and carbs. Avoid 'discretionary' foods (sweets, processed snacks) which dilute protein concentration and trigger overeating. You don't necessarily need to increase total protein grams, but you must increase its proportion in your diet by reducing low-protein energy sources.

Combining GLP-1 receptor agonists with structured exercise (specifically resistance training) mitigates the loss of lean body mass associated with pharmacological weight loss, whereas GLP-1 agonists alone result in significant lean mass loss.

If you are on a GLP-1 medication like semaglutide or tirzepatide, you must incorporate resistance training (2-3 times per week) into your routine. The medication will cause you to lose muscle along with fat (up to 40% of weight loss). Resistance training preserves this muscle, maintaining your metabolism and strength. Combine this with moderate aerobic activity (150 mins/week) and adequate protein intake for the best long-term results.

Resistance training is essential during weight loss to prevent muscle loss and maintain basal metabolic rate, thereby preventing weight regain.

Include strength training 2-4 times a week. Use weights or machines that allow you to do 10-15 reps with moderate effort (60-70% of your max). Focus on large muscle groups (legs, back, chest). This protects your muscle while you diet.

High-protein diets (>2.0 g/kg/day) are safe for healthy, highly qualified athletes, showing no adverse changes in blood biochemistry or bone mineral density.

If you are a healthy athlete, eating more than 2 grams of protein per kilogram of body weight is safe and will not harm your kidneys or bones.