to build muscle, aim for 0.7 to 1 gram of protein per pound of bodyweight per day. for a 160-pound person, that's 112 to 160 grams. your body uses protein as the raw material for rebuilding muscle tissue after every training session.
the numbers are simple. consistently hitting them is the harder part. most beginners find they're eating about half what they need.
why protein matters for muscle growth
when you lift, you create small amounts of damage in your muscle fibers. your body repairs them slightly stronger than before. this is the mechanism behind every strength and size gain you'll make in your first year.
that repair requires amino acids. amino acids come from the protein you eat. specifically, your body breaks down dietary protein into amino acids, uses them to rebuild damaged fibers, and over time, those fibers grow denser and stronger.
if you train consistently but eat too little protein, the rebuilding side of the equation runs short. progress stalls, or comes much slower than it should.
progressive overload sets the pace of adaptation. protein supplies what the adaptation needs. for a breakdown of how the training side works, see what is progressive overload?.
how much you actually need
0.7 to 1 gram of protein per pound of bodyweight per day is the practical range. the research behind it is consistent across decades of studies.
- at 140 lb: 98 to 140 grams per day
- at 160 lb: 112 to 160 grams per day
- at 180 lb: 126 to 180 grams per day
- at 200 lb: 140 to 200 grams per day
aim for the lower end of the range, hit it most days, and you'll build muscle. returns diminish past around 1 gram per pound. some people eat higher. most see no additional benefit from it.
one gram per pound is the simpler mental model. round your bodyweight in pounds, eat that many grams of protein. it's slightly over the minimum but easy to remember.
if this feels like a lot to start, aim for 0.7 first. get there consistently. then adjust upward.
where to get it
high-protein foods you can build meals around:
- chicken breast: about 31 grams per 3.5 oz
- ground beef (90/10): about 25 grams per 3.5 oz
- canned tuna: about 25 grams per can (5 oz)
- eggs: about 6 grams per egg
- egg whites: about 11 grams per 3 whites
- greek yogurt: about 17 grams per 6 oz
- cottage cheese: about 14 grams per half cup
- edamame: about 17 grams per cup, shelled
- lentils: about 18 grams per cooked cup
protein shakes (whey or casein) run about 20 to 25 grams per scoop. they're a useful way to close a gap at the end of the day or get protein in around a session when a full meal won't fit. whole food sources do the same job on muscle-building. shakes win on convenience.
three to four meals built around a protein source will get most people to their daily target.
does timing matter?
the total amount is what drives muscle protein synthesis. timing is secondary. whether you eat at 7am or 7pm matters far less than whether you hit your number by end of day.
a few things that do move the needle at the margin:
spread it out. your body can only put so much protein to use for muscle repair at one sitting. research puts the practical ceiling around 40 to 50 grams per meal for synthesis purposes. four meals at 40 grams beats one meal at 160 grams, even if the totals match. most people eating three real meals are already in decent shape here.
eat protein around training. a protein-containing meal 1 to 2 hours before a session keeps amino acid levels steady during the workout. a protein-containing meal within 2 hours after supports the repair process. neither window needs to be precise, and eating a full meal either before or after is better than obsessing over the exact minute.
the idea of a narrow "anabolic window" that closes 30 minutes post-workout has been largely walked back by more recent research. total intake, spread across the day, is the lever that actually matters.
common mistakes
underestimating what you're eating
"i eat a decent amount of protein" usually turns out to be 70 to 90 grams when you actually track it. logging meals for one to two weeks gives you a real baseline. it's often surprising. for most beginners, the fix is adding one protein source to a meal that was missing one. a glass of milk at dinner, greek yogurt for breakfast, a handful of edamame with lunch.
eating enough protein but not enough food
protein works within the context of total caloric intake. if you're consistently eating fewer calories than your body needs, your body burns some of that protein for energy, and the rebuilding stalls. total food intake is the foundation. protein sits on top of that.
rest days matter too. muscle repair happens across the 24 to 48 hours after a session. your protein intake on a rest day matters as much as your protein intake on a training day. a common mistake is eating well on training days and letting nutrition slide when you're not in the gym.
waiting to have it perfect before you start
protein intake is worth paying attention to. training consistency is the bigger lever in year one. a rough target applied most days beats a precise plan that's still being researched while you're not lifting.
start training. see how to start lifting for the first-session setup. adjust nutrition as you go.
putting it together
pick a number in the 0.7 to 1 g/lb range. for most beginners, the lower end is the right first target. then:
- log your food for a week to find your real starting point.
- identify which meals have no protein source and add one.
- keep a rough running total once you've got a feel for where you land.
two meals built around chicken, fish, or beef, one meal with eggs or greek yogurt, and a shake to close the gap if you're short. for most people at most bodyweights, that combination hits the number once it's routine.
Arc builds your training plan and tracks your sets. protein is the nutrition side of the same equation. train consistently, eat enough protein, and the adaptation compounds.
sources
- morton, r.w. et al. (2018). a systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. british journal of sports medicine, 52(6), 376-384. pubmed.ncbi.nlm.nih.gov/28698222
- schoenfeld, b.j. & aragon, a.a. (2018). how much protein can the body use in a single meal for muscle-building? implications for daily protein distribution. journal of the international society of sports nutrition, 15(10). pmc.ncbi.nlm.nih.gov/articles/PMC5828430
- aragon, a.a. & schoenfeld, b.j. (2013). nutrient timing revisited: is there a post-exercise anabolic window? journal of the international society of sports nutrition, 10(5). pmc.ncbi.nlm.nih.gov/articles/PMC3577439
start building. Arc handles the plan.
Arc builds your training program and tracks your progress. free to download.
