Browse the evidence

Global average total protein intake (78.2 g/day) exceeds the minimum requirement for health in all surveyed countries, with national means never falling below 46 g/day, indicating that protein deficiency is not a widespread global issue in terms of quantity.

You do not need to worry about global protein shortages or your personal intake being critically low if you eat a standard diet. The global average is 78g/day, and even the lowest-consuming nations average 46g/day, which is sufficient. Focus on the source (animal vs. plant) and overall diet quality rather than fearing protein deficiency.

Daily supplementation with 0.6 g/kg body weight of whey protein does not enhance body composition, core muscle endurance, or joint flexibility adaptations in trained women performing 10 weeks of Pilates training, despite increasing total daily protein intake to ~1.78 g/kg.

If you are a trained woman doing Pilates regularly, adding whey protein supplements on top of your normal diet will not make you lose more fat, gain more muscle, or improve your flexibility compared to just doing the training. Focus on consistent training and adequate whole-food protein intake rather than buying supplements.

Usual intakes of animal and plant protein are not adversely associated with all-cause, cardiovascular disease, or cancer-related mortality risk in adults.

You do not need to restrict your protein intake, whether from animal or plant sources, to avoid increasing your risk of death from all causes, heart disease, or cancer. The data suggests that typical protein intakes within recommended ranges are safe and not linked to higher mortality.

High intake of saturated fatty acids (SFA) at the population level is not associated with increased cardiovascular disease (CVD) incidence or mortality, provided the SFA is not replaced by low-quality carbohydrates.

You do not need to fear saturated fats if your overall diet is balanced. The key is not to replace fats with refined sugars or white flour. Focus on whole foods, adequate protein, and healthy fats rather than strictly limiting total fat grams.

Pre-sleep protein supplementation (20g or 60g bolus) does not improve performance, body composition, or recovery in British Army recruits undergoing basic training.

If you are undergoing intense military-style or high-volume training, taking 20-60g of protein right before bed will not give you extra strength, muscle, or recovery benefits compared to just eating enough protein throughout the day. Focus on total daily intake and training quality instead of specific supplement timing.

There is no significant evidence that total fat intake or protein intake interacts with polygenic risk to affect BMI, based on pooled meta-analyses.

Don't rely on simply increasing total protein or total fat to manage genetic obesity risk. The evidence suggests that the specific type of fat (omega-3 vs. trans/SFA) is the key dietary lever, not the total amount of protein or fat.

Orlistat produces minimal weight loss (2.78-3.16%) and has a high gastrointestinal side effect profile, making it a less effective first-line treatment compared to GLP-1RAs.

Orlistat is an over-the-counter medication that produces minimal weight loss (approx 3%). It has significant gastrointestinal side effects and is considered less effective than prescription options like GLP-1RAs. It is not recommended as a first-line treatment.

Pre-sleep protein supplementation (20g or 60g) does not improve acute muscle recovery (function, soreness, or damage markers) following load carriage in British Army recruits.

If you are doing heavy load carriage (marching with weight), adding extra protein right before bed (20g or 60g) will not speed up your recovery, reduce soreness, or protect your muscle function compared to just eating your normal diet. Focus on getting your total daily protein needs met rather than stressing about pre-sleep dosing for this specific activity.

Adopting a restricted carbohydrate diet defined as less than 45% of total energy intake does not significantly alter the risk of all-cause, cardiovascular disease (CVD), or cardiometabolic disease (CMD) mortality compared to consuming 45-65% of energy from carbohydrates.

If you choose to eat a diet where less than 45% of your calories come from carbohydrates, current large-scale data suggests this will not increase your risk of dying from heart disease, metabolic disease, or any other cause compared to eating the standard recommended amount (45-65%). You do not need to fear moderate carbohydrate restriction regarding mortality risk, provided you maintain a balanced intake of fats.

Food Frequency Questionnaires (FFQs) used in the PURE study likely overestimate carbohydrate intake and underestimate fat intake in Chinese populations due to the exclusion of edible oils from fat calculations.

When tracking your diet, do not forget to include cooking oils in your fat intake. Self-reported diets often miss these 'invisible' fats, leading to an overestimation of carbohydrate consumption.

Higher percentage of energy from protein or fat at breakfast is associated with a higher risk of major cardiovascular events, myocardial infarction, and stroke.

In this study, eating a breakfast where protein and fat make up a larger percentage of energy was linked to higher heart disease risk. This suggests that for Chinese adults, a breakfast higher in carbohydrates and lower in protein/fat may be more cardioprotective.

Isoenergetic pre-exercise meals with varying carbohydrate content (high vs. low) do not improve resistance training volume performance compared to a low-calorie placebo in resistance-trained individuals.

If you are eating a pre-workout meal, the specific amount of carbohydrates matters less than the total calories and protein, provided you are already eating a moderate amount of carbs throughout the day. You do not need to force-feed high-carb meals before lifting to maximize volume; a lower-carb, isoenergetic meal works just as well.

In older adults (≥65 years), distributing daily protein intake evenly across meals does not significantly increase muscle protein synthesis (MPS) or strength gains compared to an uneven distribution, despite theoretical models suggesting a per-meal threshold of 0.4 g/kg optimizes MPS.

For older adults engaging in resistance training, ensuring you eat enough protein throughout the day is important, but you likely do not need to stress about hitting a specific high amount (like 0.4g per kg of body weight) at every single meal. The study showed that spreading protein evenly did not provide extra muscle-building benefits over an uneven distribution when combined with exercise. Focus on getting adequate total protein and lifting weights consistently.

In untrained older adults with adequate baseline protein intake (≥1.0 g/kg/day), consuming 40 g of protein either post-exercise or pre-sleep does not enhance resistance exercise training-induced improvements in muscle thickness or strength compared to resistance exercise training alone.

If you are an older adult (60+) who is new to resistance training and already eating at least 1.0 grams of protein per kilogram of body weight every day, you do not need to stress about drinking protein immediately after your workout or eating casein right before bed. Your muscles will grow and get stronger just from doing the resistance exercises consistently. Save your money and focus on eating enough protein throughout the day and sticking to your training schedule.

Commercial protein bars in Brazil frequently overestimate their protein content by more than 20% compared to laboratory analysis, primarily due to non-protein nitrogen compounds being counted as protein by standard testing methods.

Do not blindly trust the protein number on the bar's label. This study found that 35% of bars had protein levels significantly higher than stated (overestimation). While this means you might get more protein than expected, it indicates poor quality control. If you are tracking macros precisely, assume the label is an estimate, not a guarantee, and prioritize brands with transparent third-party testing.

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.

Partially crystalline triacylglycerol droplets attenuate lipid digestion and bioaccessibility in vitro, but this effect does not necessarily translate to higher satiety or lower postprandial lipemia in humans compared to acid-stable liquid emulsions.

Don't assume that solid fats (like those in chocolate or certain cheeses) automatically digest slower or make you fuller than liquid fats. The stability of the fat emulsion in stomach acid is a critical factor for satiety that simple physical state doesn't capture.

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.

High intake of food rich in saturated fat is not independently associated with subclinical atherosclerosis (measured by carotid intima-media thickness) or its progression in high-risk European adults after adjusting for lifestyle and demographic confounders.

For individuals at high risk of cardiovascular disease, simply reducing saturated fat intake may not be sufficient to reduce subclinical atherosclerosis markers like carotid intima-media thickness. Focus on overall lifestyle factors, including physical activity, smoking cessation, and managing other risk factors, as the isolated effect of saturated fat on this specific measure was not significant in this high-risk population.

High-fat diets, particularly those high in saturated fatty acids, increase oxidative stress and mitochondrial dysfunction, leading to systemic inflammation and insulin resistance.

Reduce excessive consumption of high-fat diets, particularly those high in saturated fats, to mitigate oxidative stress and mitochondrial dysfunction. Be aware that not all fats are equal, but excessive intake contributes to inflammation and insulin resistance.

Red meat consumption does not significantly differ from various comparison diets combined in its effect on total cholesterol, LDL cholesterol, HDL cholesterol, apolipoproteins, or blood pressure.

Eating red meat does not inherently worsen your cholesterol or blood pressure if you replace it with a variety of other foods. The key is not just removing meat, but understanding what you put in its place. If you swap meat for plants, you may see better cholesterol results.

Carbohydrate co-ingestion with protein does not enhance muscle protein synthesis or muscle hypertrophy beyond protein ingestion alone, although it may aid in glycogen restoration.

You do not need to eat carbohydrates with your post-workout protein to build muscle. Protein alone is sufficient for muscle growth. Only add carbohydrates if you need to restore energy levels (glycogen) for your next training session.

Very low-carbohydrate/ketogenic, Paleolithic, and low-carbohydrate dietary patterns have low to moderate or poor alignment with 2021 AHA Dietary Guidance due to restrictions on whole grains, legumes, and oils, and high saturated fat content.

If you follow a low-carb, Paleo, or ketogenic diet, be aware that it may not align well with heart health guidelines. These diets often restrict whole grains, legumes, and healthy oils, and may be high in saturated fat. Consult a registered dietitian to ensure nutrient adequacy and minimize cardiovascular risk.

Brief adaptation (5-6 days) to a ketogenic low-carbohydrate high-fat (LCHF) diet impairs high-intensity endurance performance and increases the oxygen cost of exercise, even when muscle glycogen is acutely restored prior to competition.

If you are an endurance athlete, switching to a very low-carb, high-fat diet for even a few days can hurt your race performance, even if you eat a lot of carbs right before the event. Your body's ability to use carbs efficiently at high intensities takes longer than 24 hours to recover. Stick to high-carbohydrate availability for key workouts and races to maintain speed and efficiency.