Browse the evidence

Increasing protein intake to 1.6 g/kg body weight via whole foods for 17 weeks, with or without strength training, does not adversely affect gastrointestinal microbiota composition, richness, or diversity in community-dwelling older adults.

If you are an older adult (65-85) looking to maintain muscle, you can safely increase your protein intake to about 1.6 grams per kilogram of body weight daily. This study used whole foods (dairy, meat, plant proteins) rather than powders, and combined this diet with strength training for the last 8 weeks of a 17-week period. The key takeaway is that this level of protein does not harm your gut bacteria or cause inflammation, provided you are generally healthy and not on antibiotics. Focus on diverse protein sources like milk, soups, and lean meats.

High intake of linoleic acid (LA) does not impair the conversion of alpha-linolenic acid (ALA) to long-chain omega-3s (EPA/DHA) to a clinically significant degree, and the ratio of LA to ALA is less important than absolute intake levels.

You do not need to restrict seed oils to improve your omega-3 status. If you want more EPA/DHA, eat fish or algae supplements directly, as the body's conversion from plant sources (ALA) is inefficient regardless of how much seed oil you eat.

GLP-1 receptor agonists (GLP-1RAs) such as semaglutide and tirzepatide induce significant lean mass loss (muscle wasting) alongside fat mass loss, which exacerbates sarcopenia and frailty in patients with advanced heart failure.

If you have heart failure and are using GLP-1RAs (like Ozempic or Wegovy), be aware that you will likely lose muscle along with fat. To protect your strength, prioritize high-protein foods and engage in resistance exercise regularly. Discuss these risks with your doctor to balance heart benefits against muscle loss.

Increasing protein intake from 1.0 g/kg/day to 1.6 g/kg/day via egg white or whey protein supplementation does not further enhance physical performance (strength, endurance, aerobic capacity) in recreationally trained males and females undergoing high-intensity functional training (HIFT).

If you are already eating about 1 gram of protein per kilogram of body weight daily, adding extra protein supplements (like whey or egg white) will not make you stronger or more enduring during high-intensity functional training. Focus on your training consistency and total daily protein intake rather than buying extra supplements.

High carbohydrate intake (highest tertile, median 59.3% energy) is associated with increased MRI-detected vascular brain injury (covert brain infarcts and white matter hyperintensities) and lower cognitive scores (MoCA and DSST) in middle-aged adults.

If you are middle-aged and concerned about brain health, look at your overall macronutrient balance. High carbohydrate intake (over 59% of calories) is linked to more silent brain injuries and lower cognitive scores. Try shifting some of those carbohydrates to healthy fats, like those found in nuts, olive oil, or fish, which were associated with better brain health in this study.

Peri-operative protein or amino acid supplementation does not significantly improve muscle strength (quadriceps or handgrip) or functional outcomes in total joint arthroplasty patients.

Do not expect protein supplements to restore your leg strength after surgery. The evidence shows they help keep muscle mass from shrinking, but they do not significantly improve strength or walking ability on their own. You must combine supplementation with physical therapy and exercise to regain strength.

Higher dietary protein intake is significantly associated with higher Phase Angle (PhA) in athletes, independent of fat-free mass, sex, and age.

If you are an athlete, ensure your daily protein intake is sufficient (likely >1.2 g/kg/day, with higher intakes up to ~1.8-2.1 g/kg/day potentially offering higher Phase Angle benefits). Focus on high-quality protein sources like meat and eggs, as these were specifically linked to better Phase Angle values independent of total calories or muscle mass. This suggests that optimizing protein intake supports cellular health and muscle integrity, which can be monitored via Phase Angle.

Biathletes should consume 6–12 g/kg/day of carbohydrates, adjusted by training intensity, to maintain high carbohydrate availability and support glycogen resynthesis between sessions.

Aim for 6 to 12 grams of carbohydrates per kilogram of body weight every day. Adjust this amount up on heavy training days and down on rest days. Prioritize carbohydrate-rich foods at every meal and use high-carb snacks between sessions to keep your energy stores full.

Biathletes should consume a recovery meal containing approximately 0.3 g/kg of protein and 1.2 g/kg of carbohydrates immediately after key training sessions or races to optimize glycogen resynthesis and muscle repair.

Within 30 minutes of finishing a hard session or race, eat a meal with 0.3 grams of protein and 1.2 grams of carbohydrates per kilogram of body weight. A recovery shake is a convenient option if you can't eat a full meal immediately.

Adjuvant GLP-1 RA therapy combined with high-protein intake (≥1.2 g/kg/day) and resistance training is necessary to counteract metabolic adaptation and preserve lean body mass after bariatric surgery.

After bariatric surgery, your body fights back against weight loss by slowing your metabolism. If you experience weight regain, adding a GLP-1 medication can help. Crucially, to prevent losing muscle along with fat, you must eat at least 1.2 grams of protein per kilogram of body weight daily and engage in supervised resistance training. This combination helps maintain your metabolic health and muscle mass.

Balanced macronutrient intake (1.6-2.2g protein/kg, 4-6g carbs/kg) results in significantly greater strength gains (12.5%) and faster recovery (24 hours) compared to protein or carbohydrate deficits.

Eat a balanced diet with 1.6-2.2g of protein per kg of body weight and 4-6g of carbohydrates per kg. This supports maximum strength gains and faster recovery (24 hours) compared to restricting either nutrient.

Whey protein is the only protein source shown to have statistically significant effects on both endurance performance and muscle strength in this meta-analysis.

If you use protein supplements for performance, whey protein is the only source with demonstrated significant benefits for both endurance and strength in this analysis. Other sources (soy, casein, etc.) did not show significant effects.

Higher protein intake is significantly associated with greater hand muscle strength in adolescent karate athletes, whereas energy, fat, and carbohydrate intake are not.

For adolescent karate athletes, ensuring adequate protein intake is more critical for hand strength than simply eating enough total calories or focusing on carbs/fat. While knowing nutrition is good, it doesn't replace the need for specific nutrient intake and training. Focus on distributing protein intake throughout the day to support muscle protein synthesis alongside training.

High protein intake combined with physical rehabilitation improves muscle mass retention and functional recovery in patients undergoing ACL reconstruction.

If you are recovering from ACL surgery, ensure your diet includes adequate protein alongside your physical therapy. This combination is associated with better muscle retention and functional recovery, though more high-quality research is needed to define exact dosages.

Carbohydrate intake of 3–12 g/kg/day, adjusted for exercise duration and intensity, is recommended for athletes with diabetes to optimize glycogen storage and performance.

As a diabetic athlete, you need carbohydrates to perform. Aim for 3 to 12 grams of carbohydrates per kilogram of your body weight each day. If you train for a long time or at high intensity, aim for the higher end of this range. This helps store glycogen in your muscles and liver, which is your main energy source during exercise. Monitor your blood sugar to see how your body responds to different amounts.

Adherence to low-calorie, low-carbohydrate, low-fat, or low-sodium diets is significantly associated with improved anthropometric indicators (BMI, waist circumference, waist-to-hip ratio, body fat/muscle composition) in Moroccan adults.

If you have high blood pressure, diabetes, or high cholesterol, adopting a diet that restricts calories, carbohydrates, fat, or sodium (as defined by your doctor) is associated with better body composition and lower cardiovascular risk. Focus on the specific restriction relevant to your condition (e.g., low sodium for hypertension).

To preserve skeletal muscle mass during obesity treatment with obesity medications (OMs) or caloric restriction, patients should consume 0.8 g/kg/day of high-quality protein (minimum 60-80 g/day), with higher requirements (1.0-1.5 g/kg/day) for older adults and those with chronic diseases.

If you are losing weight with medication or diet, prioritize protein. Aim for 0.8 grams of protein per kilogram of your body weight daily, or at least 60-80 grams. If you are older or have chronic health conditions, aim higher (1.0-1.5 g/kg). Combine this with resistance exercise to protect your muscle.

A holistic primary care model combining carbohydrate reduction (targeting <130 g/day), health coaching, and community support significantly reduces HbA1c and achieves diabetes reversal or remission in patients with type 2 diabetes and prediabetes.

To manage type 2 diabetes or prediabetes, reduce your daily carbohydrate intake to below 130 grams, focusing on whole foods. Engage with a health coach for behavioral support and join community groups for peer encouragement. Monitor your HbA1c regularly with your doctor, and be prepared for potential medication adjustments as your blood sugar improves. This approach has been shown to reverse diabetes in a significant portion of patients in real-world settings.

High-protein diets (25-30% of calories) preserve lean muscle mass and improve metabolic parameters like insulin sensitivity during weight loss.

Increase protein intake to 25-30% of your daily calories to preserve muscle and improve metabolic health. Ensure you consume high-quality protein sources and balance with carbs and fats.

Pancreatic lipase inhibitors, specifically Orlistat, reduce obesity by preventing the hydrolysis of dietary triglycerides into absorbable free fatty acids and monoglycerides, thereby reducing caloric intake from fat.

Orlistat works by physically blocking your body from absorbing about 25% of the fat you eat. This leads to weight loss, but it comes with a high likelihood of gastrointestinal side effects like oily stools and gas. To minimize these side effects, you must strictly limit the amount of fat in your diet, particularly with each dose. It is a tool for weight management, not a free pass to eat high-fat foods.

GLP-1RA users often underconsume protein relative to their increased needs for preserving lean mass during rapid weight loss, despite protein percentage of calories being within the Acceptable Macronutrient Distribution Range (AMDR).

Even if your protein percentage looks fine, you are likely not eating enough grams of protein to protect your muscles while losing weight rapidly on GLP-1RA. Aim for 1.2-2.0 g of protein per kg of body weight daily. Prioritize lean protein sources in every small meal.

Myostatin-activin pathway inhibitors (MAPi), specifically bimagrumab, can reduce fat mass while preserving or increasing lean mass, offering a potential solution to the lean mass loss associated with GLP-1 agonists.

If you are concerned about losing muscle on weight loss drugs, ask your doctor about Myostatin-Activin Pathway Inhibitors (MAPi) like bimagrumab. In studies, this drug helped patients lose fat while actually gaining muscle. It is currently being studied in combination with GLP-1 drugs.

Post-exercise protein ingestion stimulates myofibrillar muscle protein synthesis (MPS) but has little to no effect on mitochondrial MPS rates during recovery from endurance exercise.

Eat protein after your endurance workout to help repair muscle fibers. However, don't expect it to directly boost your mitochondrial energy production; that is driven more by the exercise itself.

Moderate consumption of dairy products, particularly fermented dairy like yogurt, is associated with reduced cardiovascular risk and lower long-term weight gain, contrary to historical concerns about saturated fat.

You can include moderate amounts of dairy in your diet, especially fermented options like yogurt and cheese. They are linked to lower cardiovascular risk and weight gain. Avoid very high intake (>1000g/day).