Protein recommendations online run anywhere from "the RDA is fine" (0.36g/lb) to "2g per pound or you're wasting your time." Both extremes are wrong, and the truth is more boring — which is exactly why nobody markets it. If you lift, 0.7–1.0 grams per pound of your current bodyweight per day covers it. If you don't lift, you need less than that and still more than the RDA. The rest of this is where those numbers come from and what they look like on a plate.
What the research actually supports
For people who lift, the meta-analyses converge on a range of roughly 0.7–1.0g per pound of body weight per day (1.6–2.2 g/kg). Above that, the measurable benefit for muscle growth flattens out. Not to zero — but close enough that forcing down an extra 60g a day is effort spent in the wrong place.
The cleanest number in that literature is Morton's 2018 meta-analysis, which pooled 49 studies and 1,863 people and found that extra protein stopped adding muscle past about 1.62 g/kg per day — roughly 0.73g per pound. The honest caveat: the confidence interval around that breakpoint runs from 1.03 all the way to 2.20 g/kg. So the top of the range isn't a waste — it's a defensible hedge against where the true plateau actually sits. It just isn't a lever you can pull harder.
Two adjustments worth knowing:
- In a fat-loss deficit, aim at the higher end. Protein is what tells your body to burn fat instead of muscle when calories are short. This is the single most expensive thing to get wrong on a cut.
- Use your current weight — don't overthink it. Your bodyweight in pounds is the anchor; you don't need goal-weight math or a lean-mass formula. Simple and repeatable beats precise-looking every time.
How much protein do you need if you don't lift?
Less than a lifter — and almost certainly more than the RDA you've been quoted. The RDA is 0.8 g/kg (about 0.36g per pound), and it's worth knowing exactly what that number is: it was set with nitrogen-balance studies as the intake that prevents deficiency in 97.5% of healthy adults. That's a floor. Nobody designed it as the amount that keeps you strong, full, or holding onto muscle over decades.
Phillips, Chevalier and Leidy's 2016 review makes the case for 1.2–1.6 g/kg — about 0.55–0.7g per pound — as the range where protein starts doing something for you instead of merely keeping you out of trouble. For a 170lb person who doesn't train, that's roughly 90–125g a day against the RDA's 62g.
Notice where the two ranges meet: the top of the sedentary range (1.6 g/kg) is the bottom of the lifting range. Protein isn't a gym supplement that stops mattering when you leave the building, and the guy who isn't training has less margin, not more — no training stimulus is helping him hold onto muscle.
Cutting, maintaining, or building: why your number moves
Because the job protein is doing changes with the goal. Here's what the protein calculator on this site uses, in grams per pound of current bodyweight:
- Losing fat (calorie deficit) — 0.9–1.1g per pound. At 200lb that's 180–220g a day.
- Maintaining — 0.7–0.9g per pound. At 200lb that's 140–180g a day.
- Building muscle (slight surplus) — 0.8–1.0g per pound. At 200lb that's 160–200g a day.
Fat loss is the highest of the three, which surprises everyone who assumes bulking is when protein matters most. Two reasons. First, in a deficit your body is actively hunting for tissue to break down, and protein is the signal that redirects it toward fat — Leidy's 2015 review in the AJCN found higher-protein energy-restricted diets produced greater weight loss, greater fat loss, and better lean-mass preservation than lower-protein diets at the same calories, landing on 1.2–1.6 g/kg and ~25–30g per meal. Second, protein is expensive to digest: Westerterp's 2004 review puts the thermic effect of protein at 20–30% of the calories it contains, versus 5–10% for carbs and 0–3% for fat. It's also the most filling macro per calorie, which is exactly what you need when calories are short.
If holding muscle through a cut is the worry, that's the whole subject of how to lose fat without losing muscle. If you're training to add size, the research breakdown on how much protein to build muscle covers why the bottom of the range does most of the work. And if the cut has an actual endpoint in mind, the deficit-and-protein pairing that gets you there is mapped out in how to get to 10% body fat.
The 30-second version: your current body weight in pounds × 0.9 is a number almost nobody regrets. I anchor at the top of that range — a flat 1g per pound, which puts me around 200g a day — because protein is filling and it's cheap insurance when calories are short. Don't want to do the math? Run your numbers through the protein calculator — it works off your current weight and adjusts for whether you're cutting or building.
What that number looks like as actual food
This is where most people quit, because "200g of protein" means nothing until you've seen it on plates. Here's what the anchor foods actually deliver:
- Chicken breast, 6oz cooked — about 50g
- Nonfat Greek yogurt, 1 cup (245g) — about 24g
- Whey protein, 1 scoop — about 24g
- Eggs, 3 large — about 18g
- Lentils, 1 cup cooked — about 18g
A 200g day averages 50g a meal across four meals, which is not a heroic feat: an egg-based breakfast with whites stacked on top, a 6oz chicken breast at lunch, a shake or a cup of Greek yogurt in the afternoon, and a protein-anchored dinner. The per-item math is in how much protein is in chicken breast and how much protein is in an egg; the full menu ranked by protein per calorie and per dollar is in high-protein foods, and the breakfast slot — the one most people leave nearly empty — has its own rotation in high-protein breakfast ideas. Lunch is the other slot that quietly runs short, usually because it happens at a desk with no stove; five that clear 40g anyway are in high-protein lunch ideas.
Two honest caveats. You don't need powder — it's a convenience tool that's cheap per gram, and whole food does everything it does; protein powder vs whole food is the real comparison. And plant-based works, it just takes more volume and more variety, which vegan protein sources maps out.
One thing from my own logging: the number is only real if you weigh and track what you eat. I track every macro, every day, which is the only reason I know I'm hitting 200g instead of assuming it. Eyeballed portions drift upward, and the gap between what you think you ate and what you actually ate only shows up once you weigh it.
Is too much protein bad for you?
In healthy people, no — it just stops being useful. The kidney-damage warning is the one that scares people off, and it doesn't survive the evidence: Devries' 2018 meta-analysis in the Journal of Nutrition pooled 28 trials and 1,358 participants and found no difference in kidney function between people eating higher-protein diets and people eating normal or lower-protein ones. (That's healthy kidneys. Diagnosed kidney disease is a real medical question — that one goes to your doctor, not to an article.) I took that fear apart in full — where it came from, and the one group it does apply to — in is too much protein bad for your kidneys.
What eating far more buys you is nothing. Antonio's 2014 trial had 30 resistance-trained people eat 4.4 g/kg — roughly 2 grams per pound, double the top of the range — for eight weeks, against a control group at 1.8 g/kg. Result: no significant change in body weight, fat mass, fat-free mass, or body-fat percentage in either group, even though the high-protein group was eating roughly 800 extra calories a day. Nothing broke. Nothing improved either.
So the ceiling isn't a safety line, it's a usefulness line. Past about 1g per pound, protein is just calories you could have put toward carbs that fuel harder training.
Where the marketing exaggerates
- "You can only absorb 30g per meal." You absorb essentially all of it; the question is how much maximally stimulates muscle protein synthesis per sitting, and even there the 30g ceiling doesn't hold up — especially for whole-food meals that digest slowly. The full teardown is in the 30-gram protein per meal limit.
- "You need protein within 30 minutes of training." The anabolic window is more like a garage door than a mail slot. Daily total beats timing by a mile — see protein timing myths.
- "Plant protein doesn't count." It counts; you just need slightly more of it and some variety, because plant sources are lower in leucine and sometimes incomplete.
- "Hair loss and brittle nails mean you're protein deficient." Those are symptoms of genuine clinical deficiency, which is rare if you eat enough food to hold your bodyweight. The real signs you're not eating enough protein are much quieter — poor recovery, constant hunger, losing muscle when you diet.
What actually matters, in order
- Daily total — the 0.7–1g/lb range. This is 90% of the game.
- Spread across 3–4 meals — a real but small effect.
- Everything else — timing, type, powders — is rounding error.
If hitting your number is the problem (it usually is), the four-meal structure in How To Hit 200g of Protein a Day is the system I actually use. The meals, the grocery list, and the restaurant workarounds are written out in The 200g Protein Blueprint.