Protein & macros
19 questions in this area. Each answer starts with the short version, carries an evidence grade and links its sources.
- Can you build muscle on a vegan diet?Yes. With enough total protein you build muscle just as well on a vegan diet, and strength gains match those of omnivores. What decides the outcome is the amount of protein and the training, not whether the protein comes from animals or plants.
- Can your body only absorb 30 grams of protein in one meal?No. Your gut absorbs virtually all the protein you eat, even in a large portion; it just takes a little longer. The 30-gram ceiling, at most, describes how much muscle-building a single meal can maximally trigger, not how much protein your body can put to use.
- Do carbs eaten late at night make you gain weight?No. What decides your weight is how much you eat across the day, not what the clock says when the carbohydrates land on your plate. An evening of carbs within your daily needs won't make you fatter than the same food eaten earlier.
- Do I need protein powder, or can I get enough from food?Food is enough. Protein powder is nothing your body needs; it is simply a cheap, convenient way to hit your protein target on days when meals fall short.
- Do I need protein right after my workout?No. The so-called anabolic window is much larger than long believed — hours, not 30 minutes. Your total protein over the day matters far more than exactly when you eat.
- Do older adults need more protein than young people?Yes, usually a little more. With age the muscles respond less well to protein, and most healthy older adults do well on around 1.0–1.2 grams per kilogram of body weight per day, against the 0.8 that has long been the adult minimum. It is a modest increase, not a large one.
- Does eating fat make you fat?No. What decides whether body fat increases is your total energy intake, not whether the calories happen to come from fat. Fat is energy-dense and therefore easy to overeat, but that doesn't make it the enemy.
- Does eating more protein help you lose fat?Not on its own — protein doesn't burn fat and creates no calorie deficit by itself. But during a deficit, more protein means more of what you lose is fat and less is muscle, and it keeps you fuller, which makes the diet easier to stick to.
- Does eating protein before bed help build muscle?It doesn't hurt, and it can be a simple way to reach your daily protein target. But the muscle gain seen in the studies probably comes from getting more protein overall, not from the evening itself being special.
- Does protein really keep you fuller than carbs or fat?Yes, calorie for calorie protein is the most filling of the three. The effect is real but moderate, and its main value is making a calorie deficit easier to hold without being constantly hungry.
- How many eggs can I eat per day, and do they raise cholesterol?For most healthy people, up to one egg a day is not linked to heart disease. Eggs are high in cholesterol, but for most people dietary cholesterol raises blood cholesterol surprisingly little.
- How much protein do I actually need per day?For most people who train, around 1.6 grams of protein per kilogram of body weight per day is enough to build and keep muscle. More than that rarely adds muscle, and someone who is sedentary gets by on less.
- How should I split protein, carbs and fat?There is no single percentage that fits everyone. Set protein at a sensible level, keep calories where you want them, and split carbs and fat however you enjoy and can stick to.
- Is a high-protein diet bad for your kidneys?No, not for healthy kidneys. The research shows no evidence that a high-protein diet harms the kidneys in healthy adults. If you already have kidney disease the picture is different, and your protein level is a matter for your doctor.
- Is plant protein as good as animal protein (or whey) for building muscle?Yes, in practice just as good for your muscles, as long as you get enough protein overall. The amount matters more than the source.
- Is saturated fat actually bad for you?Neither hero nor villain. What matters is what you swap it for: replace saturated fat with unsaturated fat from plant oils and heart-disease risk falls, but trade it for sugar and refined flour and you gain nothing.
- Is sugar really that bad for you?Sugar is neither a poison nor a drug. In excess it contributes to weight gain through the calories it adds, like any other food, and free sugars also affect dental health. The dose and the context matter more than the ingredient itself.
- Is the sugar in fruit bad — does fruit make you fat?No. The sugar in whole fruit doesn't behave like the sugar in soda, and fruit doesn't make you fat on its own. Like any food, fruit can add to weight gain only if it pushes you past your total calorie needs.
- Should I spread my protein evenly across meals?Yes, it helps a little. Spreading protein across your meals gives slightly better conditions for building muscle than saving nearly all of it for dinner, but the effect is small and your total daily protein decides most of the outcome.