How Much Protein Do I Really Need?
This is the question I get more than any other. It comes up in consultations, it comes up in the gym, and it comes up from people who've been training for years and still aren't sure they're getting it right.
The reason it keeps coming up is that the answers you find online are wildly inconsistent. One source tells you 0.8 grams per kilogram of body weight. Another tells you about a gram per pound. A third tells you it doesn't matter much as long as you're eating "enough." Those aren't small differences. For a 180-pound person, that's the gap between roughly 65 grams and 180 grams a day. Somebody is wrong.
Let me clear it up and show you where the numbers actually come from.
The number you've probably heard is a minimum, not necessarily a target.
The 0.8 grams per kilogram figure- about 65 grams per day for that 180-pound person is the RDA, established by the Institute of Medicine's Dietary Reference Intakes [1]. It's a real number from real research, and it gets quoted constantly. The problem is what it actually measures.
The RDA is the amount required to meet the needs of nearly all healthy sedentary adults. It's the floor. It was never designed to answer the question "how much protein do I need to build muscle, recover from hard training, and hold onto lean mass while I lose fat?"
Using the RDA as your training target is like asking how much sleep you need to avoid collapsing and then building your schedule around that answer. Technically correct. Practically useless, in my opinion.
What the research actually supports. The single most useful piece of evidence here is a 2018 meta-analysis by Morton and colleagues in the British Journal of Sports Medicine [2]. They pooled 49 randomized controlled trials covering 1,863 participants and ran a break-point analysis to find where extra protein stops producing extra muscle. The answer: roughly 1.62 grams per kilogram of body weight per day or roughly 0.73 grams per pound. Beyond that point, additional protein produces no further gains in fat-free mass. One honest caveat that most articles skip: 1.62 is the central estimate, and the 95% confidence interval around it runs from about 1.03 to 2.20 g/kg [2]. That statistical uncertainty is exactly why you'll see the practical range quoted as 1.6 to 2.2 g/kg. The International Society of Sports Nutrition's position statement lands in similar territory, recommending 1.4 to 2.0 g/kg/day for most exercising people [3]. So: start around 0.7 grams per pound. That's the baseline. There are three situations where you should push toward the upper end, closer to 1 gram per pound: You're in a calorie deficit. This is the strongest case for eating more protein, not less. Helms and colleagues reviewed the literature on lean, resistance-trained athletes in energy restriction and concluded their needs likely sit at 2.3 to 3.1 grams per kilogram of fat-free-mass, scaling upward the leaner you get and the more aggressive the deficit [4]. Note that's per kilogram of lean mass, not total body weight, which is a distinction that gets mangled constantly online. The ISSN position statement cites the same range for hypocaloric periods [3]. You're older. Aging muscle becomes less responsive to protein, a phenomenon called anabolic resistance. The PROT-AGE study group, convened by the European Union Geriatric Medicine Society, recommends that healthy adults over 65 consume 1.0 to 1.2 g/kg/day, rising to 1.2 to 1.5 g/kg/day for those managing illness [5]. Morton's meta-analysis found the same thing in the opposite direction: the benefit of added protein decreased as participant age increased [2]. This is one of the most under-discussed issues in fitness, and it matters enormously for long-term strength and independence.
You're training hard and frequently. More training stress means more repair demand, and the upper half of the range makes sense.
One adjustment: if you're carrying a significant amount of body fat, calculate from your goal weight or lean body mass rather than current scale weight. Fat tissue doesn't need feeding. Running the math off a number that includes the 60 pounds you're trying to lose gives you a target that's needlessly high and hard to hit.
Spread it out.
Total daily intake matters most. But distribution isn't nothing. Your body doesn't stockpile protein the way it stores carbohydrates and fat. To fully stimulate muscle protein synthesis, a single sitting needs to deliver enough. Schoenfeld and Aragon reviewed the dose-response literature and concluded that a target of 0.4 grams per kilogram per meal across a minimum of four meals is the cleanest way to hit 1.6 g/kg/day [6]. For a 180-pound person, that's about 33 grams per meal. The ISSN puts the practical per-dose figure at 20 to 40 grams, distributed every three to four hours [3].
Eating 20 grams at breakfast, 25 at lunch, and 130 at dinner technically hits a high daily total, which is beneficial but harder on the body.
Three to four solid protein feedings across the day are a practical target. You don't need to be precise about timing. You just need each meal to actually contain protein rather than being a carb dish with protein as the garnish.
What this looks like in real food. Numbers are abstract until you see them on a plate.
Rough guide:
Chicken breast, 6 oz cooked = 50g
Lean ground beef, 6 oz cooked = 45g
Salmon fillet, 6oz =40g
Greek yogurt, 1 cup = 20g
Whey protein, 1 scoop = 25g
Cottage cheese, 1 cup = 25g
3 whole eggs = 18g
For most people I work with, hitting a proper protein target means adding one deliberate protein source to breakfast and no longer treating lunch as an afterthought. That's usually the whole fix.
The Kidney Question.
I'll address this because someone always asks or makes a smart comment on a Facebook thread. Devries and colleagues ran a meta-analysis of 28 randomized controlled trials covering 1,358 participants, specifically examining whether higher protein intakes harm kidney function in adults without kidney disease [7]. When they compared the change in glomerular filtration rate between higher- and lower-protein groups, they found no effect. Their conclusion was direct; higher protein intakes do not adversely affect kidney function in healthy adults. The concern originated with research on patients who already had impaired kidney function, and it got generalized to everyone else. The exception is real, though. If you have diagnosed kidney disease, this is a genuine conversation to have with your physician, and your intake should be set by them - the PROT-AGE authors specifically flag severe kidney impairment as a case where protein may need to be limited [5]. If you don't have kidney disease, the evidence doesn't support the worry.
The part nobody wants to hear. Here's what I have learned from doing this for a while: almost nobody fails at protein because they didn't know the number. They fail because they're eating on the road four days a week. Because the only thing anyone in the house will eat for dinner is pasta. Because they leave the house at 5:30 in the morning and breakfast is whatever's at the gas station. Because 180 grams a day sounds fine on paper and turns out to be genuinely difficult when you actually try to do it in your real life. This is the same thing I wrote about in my last post. A number doesn't fail you. A number that doesn't fit your schedule, your budget, your cooking ability, and your preferences fails you - every single time. The best protein target is the one you'll actually hit on a Wednesday in February when work is busy, and you're tired. That's the work I do with clients: not handing over a number but building the systems that make the number happen. The short version
Start at 0.7 grams per pound of body weight (1.6g/kg) [2]
Move toward 1 gram per pound (~2.2g/kg) if you're cutting, over 65, or training hard [3,4,5]
Calculate from goal weight or lean mass if you have a significant amount to lose
Spread it across at least four meals, roughly 0.4g/kg each [6]
Build it around your actual life, not an ideal one
If you're not sure where you land, or you've been trying to hit a target and it isn't happening, that's exactly the kind of thing we sort out in an intake. Reach out and let's look at what you're actually eating.
References
Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrates, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. Washington, DC: National Academies Press; 2005.
Morton RW, Murphy KT, McKellar SR, et al. 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. 2018;52(6):376–384. doi:10.1136/bjsports-2017-097608
Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition. 2017;14:20. doi:10.1186/s12970-017-0177-8
Helms ER, Zinn C, Rowlands DS, Brown SR. A systematic review of dietary protein during caloric restriction in resistance trained lean athletes: a case for higher intakes. International Journal of Sport Nutrition and Exercise Metabolism. 2014;24(2):127–138.
Bauer J, Biolo G, Cederholm T, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. Journal of the American Medical Directors Association. 2013;14(8):542–559. doi:10.1016/j.jamda.2013.05.021
Schoenfeld BJ, Aragon AA. 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. 2018;15:10. doi:10.1186/s12970-018-0215-1
Devries MC, Sithamparapillai A, Brimble KS, Banfield L, Morton RW, Phillips SM. Changes in kidney function do not differ between healthy adults consuming higher- compared with lower- or normal-protein diets: a systematic review and meta-analysis. The Journal of Nutrition. 2018;148(11):1760–1775. doi:10.1093/jn/nxy197
***The nutritional information in this article is general education, not individualized medical or dietary advice. If you have a diagnosed medical condition, particularly kidney disease, talk to your physician before making significant changes to your protein intake.
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