Most nutrition questions don't have a clean number. This one nearly does.
How much protein do you need to build muscle?
For building or keeping muscle, aim for roughly 1.6–2.2 grams of protein per kilogram of bodyweight per day. A large meta-analysis found benefits to muscle and strength rising up to about 1.6 g/kg on average, with the range extending to around 2.2 g/kg. In a fat-loss phase, sit at the higher end to protect muscle while you lose fat.
That's it for the headline. The rest is making it practical.
Protein targets by situation
| Situation | Target | 80 kg (176 lb) person |
|---|---|---|
| General / maintenance | ~1.6 g/kg/day | ~130 g/day |
| Building muscle | ~1.6–2.0 g/kg/day | ~130–160 g/day |
| In a fat-loss deficit | ~1.8–2.2 g/kg/day | ~145–175 g/day |
Targets adapted from Morton and colleagues (2018) and Helms and colleagues (2014). If you carry a lot of body fat, basing the target on a lean or goal bodyweight avoids overshooting.
Why protein earns its reputation
It builds and preserves muscle, keeps you full, and costs the most energy to digest of the three macros. In a deficit, adequate protein is the difference between losing fat and losing fat plus the muscle you worked for — one of the pillars of losing fat without losing muscle.
Timing matters less than you think
The "anabolic window" is wider than the old 30-minute myth. Total daily protein and consistency matter far more than the clock. A practical approach: spread it across three to five meals, each with a solid protein source, which also helps with fullness. If a shake helps you hit the number, use one — see where supplements actually help.
Where to get it
- Animal: chicken, lean beef, fish, eggs, Greek yogurt, cottage cheese, milk.
- Plant: soy (tofu, tempeh, edamame), legumes, seitan, and a protein powder if convenient.
Build most meals around a palm or two of a protein source and the daily total tends to take care of itself. For the full picture, see how to build a balanced plate.
Hitting ~150 g on a busy day
The number feels big until you see it laid out. A rough day near 150 g:
- Breakfast: 3 eggs + Greek yogurt — ~35 g
- Lunch: a chicken breast + rice + salad — ~45 g
- Snack: cottage cheese or a shake — ~30 g
- Dinner: salmon or tofu + potatoes + veg — ~40 g
Anchor every meal with a real protein source and the daily total mostly takes care of itself — no spreadsheet required. A shake is a convenient way to close the gap, not a magic ingredient.
Frequently asked questions
Can you eat too much protein? For healthy people, intakes in this range are well tolerated. Beyond roughly 2.2 g/kg you're unlikely to gain extra muscle benefit — the calories are better spent elsewhere.
Do you need protein right after training? Helpful but not urgent. A protein-containing meal within a few hours is plenty; the daily total is what drives results.
Is more protein better for fat loss? Up to a point — the higher end of the range protects muscle and blunts hunger in a deficit.
Protein is one piece. The System's nutrition section covers energy balance, carbs, fats, and a sample day you can copy. The full framework — the goal dials, the 4-day template, the exercise library with home substitutions, and the nutrition section — lives in The Adaptable Strength & Conditioning System, a $19 digital guide (reg. $29). It's education, not a prescription: it carries a health disclaimer and assumes you'll train sensibly.
Source: Morton RW et al., British Journal of Sports Medicine, 2018. Browse the Fitness & Nutrition guides.