For active adults, the evidence-based protein target is 0.7 to 1.0 grams per pound of body weight per day (1.6–2.2 g per kg). A 160 lb person aiming for the middle of this range should hit 130–145 g of protein/day. This range comes from meta-analyses of resistance-training studies and covers both muscle building and muscle preservation during weight loss. Below 0.7 g/lb, muscle protein synthesis is sub-optimal. Above 1.0 g/lb, research shows diminishing returns — extra protein mostly becomes energy, not tissue.
The Quick Recommendation by Goal
| Goal | Grams per pound | Grams per kg | Example (160 lb) |
|---|---|---|---|
| Sedentary, no training | 0.36 g/lb (RDA) | 0.8 g/kg | 58 g |
| Active but not focused on body comp | 0.5–0.7 g/lb | 1.2–1.6 g/kg | 80–110 g |
| Resistance training, muscle gain | 0.7–1.0 g/lb | 1.6–2.2 g/kg | 110–160 g |
| Fat loss while training (muscle preservation) | 0.9–1.2 g/lb | 2.0–2.6 g/kg | 145–190 g |
| Very lean athletes, contest prep | 1.0–1.4 g/lb | 2.2–3.1 g/kg | 160–220 g |
Use the macro calculator to split your full daily calories into protein, carb, and fat grams in one step.
Why “Per Pound of Body Weight” — and the Caveat
Protein requirements scale with lean mass, not total mass. Two people at 200 lb — one at 12% body fat (176 lb lean) and one at 32% body fat (136 lb lean) — have different protein needs. “Per pound of total body weight” is a practical shortcut that works well at normal body-fat ranges.
If you’re significantly overweight (>30% body fat for men, >40% for women), calculate protein off target body weight or lean body mass, not current body weight. Using current body weight in these cases over-prescribes protein.
The Research, in One Minute
The canonical reference: a 2018 meta-analysis by Morton et al. in the British Journal of Sports Medicine, combining 49 resistance-training studies across 1,863 subjects. The findings:
- Protein intake correlated with muscle gain up to ~1.62 g/kg/day (0.74 g/lb).
- Above 1.62 g/kg, additional protein produced no additional muscle gain.
- Studies enforcing 2.2+ g/kg (~1.0 g/lb) showed no penalty from “too much protein.”
- Benefits were strongest in trained lifters; untrained subjects gained muscle well across a wide protein range.
The practical takeaway: for most trained adults, hitting ~0.8 g/lb is the point where you’ve captured most of the muscle-building effect. Going higher to 1.0 g/lb adds a safety buffer and aids satiety during a cut — but isn’t biologically required.
Why You Need More Protein During Weight Loss
During a calorie deficit, the body catabolizes both fat and muscle. The rate of muscle loss is strongly influenced by protein intake. Longland et al. (2016, AJCN) fed two groups a calorie-restricted diet with resistance training for 4 weeks:
- High-protein group: 2.4 g/kg (1.1 g/lb) → lost 10.5 lb fat, gained 2.6 lb muscle
- Low-protein group: 1.2 g/kg (0.55 g/lb) → lost 7.7 lb fat, no muscle change
Same calorie deficit, radically different body-composition outcomes. This is why protein targets go up during cutting, not down — you’re defending lean tissue under energy stress. Plan your deficit size with our calorie deficit calculator, and make sure protein doesn’t go with it.
How Much Protein Is Too Much?
Practical ceiling
Research hasn’t found an upper limit that causes harm in healthy adults. Studies have run subjects on 3+ g/kg (~1.4 g/lb) for weeks without adverse effects. “Kidney damage from high protein” is a myth for people with healthy kidneys — the claim comes from observations in existing renal patients, not healthy adults.
Where extra protein stops paying off
Around 1.0 g/lb, further increases stop producing extra muscle or fat loss. More protein = more energy — not more tissue. If you’re not cutting and you’re already at 1.0 g/lb, the extra calories are doing more than the extra protein.
Individual exceptions (do not DIY)
If you have chronic kidney disease, diabetic nephropathy, or liver disease, consult a nephrologist + registered dietitian. Protein restriction is often part of the therapeutic protocol and the standard recommendations do not apply.
How to Hit Your Protein Target Without Obsessing
The rule of thirds
Split your target across 3 meals. For a 160 lb person targeting 130 g, that’s ~45 g per meal. One hand-sized serving of protein (chicken, fish, tofu, eggs, cottage cheese) is typically 25–35 g — so each meal gets ~1.5 hand portions.
Good protein sources by density
| Food | Typical portion | Protein (g) |
|---|---|---|
| Chicken breast, cooked | 100 g | 31 |
| Greek yogurt, plain | 170 g (1 cup) | 17 |
| Eggs | 2 large | 12 |
| Tuna, canned | 1 can (142 g) | 32 |
| Cottage cheese, 2% | 1 cup | 28 |
| Tofu, firm | 100 g | 10 |
| Lentils, cooked | 1 cup | 18 |
| Whey protein powder | 1 scoop (30 g) | 24 |
| Salmon, cooked | 100 g | 25 |
| Lean ground beef, 90/10 | 100 g | 26 |
Photo-based protein tracking
Manually weighing and logging every protein source is tedious, and it’s why most people quit before hitting their targets. AI macro tracking from photos gives you a per-meal protein estimate in seconds — protein is actually the most accurate macro for photo-based AI because it’s usually visible (meat, fish, eggs, tofu) with clear portion cues.
Common Scenarios
”I’m 150 lb and trying to build muscle — what should I eat?”
Target 105–150 g protein/day (0.7–1.0 g/lb). Start at 120 g and see if muscle gain is occurring after 4 weeks. Need calorie surplus on top — pair with 10–15% above your TDEE.
”I’m 200 lb and want to lose fat without losing muscle.”
Target 180–200 g protein/day (0.9–1.0 g/lb). Run a ~20% calorie deficit and keep resistance training 2–3×/week. Expect 0.8–1 lb/week of weight loss, most of it fat.
”I’m 140 lb, sedentary, just want to be healthy.”
0.5 g/lb (70 g/day) is plenty. The standard RDA of 0.36 g/lb (50 g) is technically the minimum to avoid deficiency, not the optimal intake for healthy adults. 70 g is easier to hit and better supports satiety.
”I’m on a plant-based diet.”
Same targets. Plant proteins have lower per-gram “leucine content” (the amino acid that triggers muscle protein synthesis), so there’s a case for going 10–15% above the standard target — e.g., 1.0 g/lb instead of 0.8 g/lb. Lentils, tofu, tempeh, seitan, and textured vegetable protein all work. Protein powder (pea, soy, rice blend) fills gaps.
”I’m over 60.”
Protein needs increase with age due to “anabolic resistance” — the same protein dose produces less muscle protein synthesis in older adults. Target 1.0–1.2 g/lb (1.2–1.6 g/kg) from age 60+, especially if resistance training. This is a standard recommendation from the PROT-AGE international working group.
The Bottom Line
Pick a number in the 0.7–1.0 g/lb range based on your goal. Hit it consistently. The gap between “hits protein target 6 days/week” and “hits protein target 2 days/week” is more important than the gap between “0.8 g/lb” and “1.0 g/lb.” For practical daily tracking, use the macro calculator for targets and photo-based macro tracking to stay on them without the logging friction that breaks most diet attempts — see why people quit calorie tracking apps for the failure-mode data.
Sources
- Morton, R.W. et al. (2018). British Journal of Sports Medicine — A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength
- Longland, T. et al. (2016). American Journal of Clinical Nutrition — Higher compared with lower dietary protein during an energy deficit
- Bauer, J. et al. (2013). Journal of the American Medical Directors Association — PROT-AGE Study Group recommendations for protein intake in older adults
- Phillips, S.M. et al. (2016). Applied Physiology, Nutrition, and Metabolism — Protein “requirements” beyond the RDA
