Browse evidence-based analysis of health-related claims and assertions
Part of why protein makes you feel full is because your body burns more calories digesting it, but we still don’t know how much hormones in your gut are involved.
Descriptive
In the short term, meat and dairy make your body burn more calories after eating than plant proteins like beans or tofu, but after a while, both types work the same way.
Eating more protein while losing weight helps you lose fat instead of muscle and improves your blood sugar and cholesterol levels.
After losing weight, eating more protein helps you keep it off because it keeps you full, burns more calories during digestion, and helps you keep muscle instead of losing it.
Eating more protein makes you feel fuller for longer than eating the same amount of carbs or fat, which helps you eat less and manage your weight better.
New lifters can gain about 3 pounds of muscle in the first few months, but after that, it gets much harder—after years of training, you might only gain a pound or two per year.
Quantitative
Muscles don’t grow by filling up with water or sugar—they grow by adding more of the actual contractile parts that make them strong.
Mechanistic
Feeling that muscle pump after a workout doesn’t make your muscles bigger—it’s just fluid and fatigue, not a growth signal.
Causal
Even if your testosterone spikes after a workout, it doesn’t make your muscles grow any faster—what matters is the actual lifting, not the hormone rush.
Lifting weights makes your muscles grow mainly because the force you create when you contract your muscles sends a signal inside them to build more protein—other things like muscle pump or hormones don’t really matter for growth.
Whether you train with one joint (like leg extensions) or multiple joints (like squats), you get just as strong at the movement you train — but if you train a simple movement, you get a bit stronger at holding still too, compared to complex movements.
Beginners get the biggest strength boosts from lifting weights, but even they get way stronger at moving weights than at holding still — the gap between those two types of strength stays the same no matter how fit you are.
Getting stronger at lifting weights doesn’t make you much stronger at pushing or holding something still — they’re like two different kinds of strength, not just one ability measured two ways.
Even though lifting weights makes your muscles bigger and more active, those changes don’t explain why you get stronger at dynamic movements but not at holding static positions — something else, like how your brain coordinates movement, might be more important.
People with more active brown fat burn about 2% more of their carb meal’s energy as heat than people with less active brown fat—this could explain why some people stay leaner even when eating the same food.
People with more active brown fat burn an extra 2% of their meal’s calories after eating carbs—enough to potentially affect weight over time.
Your brown fat only helps burn calories after you eat carbs—not after you eat protein or fat.
Correlational
After three sets of bench press with only 1 minute of rest, wrestlers start to struggle more — this is the point where fatigue really hits if you don’t rest long enough.
When wrestlers take 3 minutes to rest between bench press sets instead of 1 minute, they can do more reps, lift more total weight, and move the bar faster in the last few sets — meaning longer breaks help them perform better later on.
Whether you get your protein from chicken, tofu, milk, or fish, it doesn’t make your body burn more calories — the type doesn’t matter, only the amount.
Eating a meal with more protein makes your body burn more calories right after eating — but only if you’re not overweight; if you are, this calorie-burning effect doesn’t happen as much.
When people who lost weight eat more protein, their bodies use more of that protein for energy and repair, rather than storing it.
The more your body slows down its calorie burning after losing weight, the more likely you are to eat more than you burn — which makes you gain weight back.
Eating more protein and fewer carbs after losing weight makes your body burn more fat and less sugar for energy, helping you stay in a calorie deficit.