Protein is the most over-discussed and under-hit macro in fitness. The RDA says 0.8g per kg of bodyweight. Influencers say 1g per pound. Research says something in between — and the answer depends on what you're actually trying to do.
This guide cuts through the noise with specific daily targets backed by controlled research, and shows you how to hit them without tracking every gram.
What Protein Actually Does
Protein provides the amino acids your body uses to repair muscle tissue, produce enzymes and hormones, maintain immune function, and build virtually every structure in your body. Unlike carbs and fat, your body cannot store protein in meaningful amounts — so intake needs to happen daily.
For anyone who lifts, runs, or trains seriously, protein plays two key roles: it drives muscle protein synthesis (the process that repairs and grows muscle) and it helps preserve muscle when you're in a calorie deficit.
The RDA Is a Floor, Not a Target
The Recommended Daily Allowance (0.8g/kg, or about 0.36g/lb) is the minimum to prevent deficiency in sedentary adults. It's not the optimal amount for anyone who trains, is over 40, or is trying to change their body composition.
A 2018 meta-analysis by Morton et al. in the British Journal of Sports Medicine analyzed 49 studies and concluded that 1.6g per kg of bodyweight (0.73g/lb) is the point where additional protein stops providing extra muscle-building benefit in trained individuals.
For most people, that's the number worth remembering.
Daily Protein Targets by Goal
Muscle Gain
1.6–2.2g per kg of bodyweight (0.73–1.0g/lb)
For a 180lb person, that's 130–180g per day. The upper end is useful for advanced lifters or people in a bulk — there's no harm in slightly more, but no meaningful benefit either.
Fat Loss
1.8–2.4g per kg of bodyweight (0.82–1.1g/lb)
Higher than muscle-gain range because protein needs actually increase in a calorie deficit. Protein preserves lean mass when you're losing weight, keeps you full, and has the highest thermic effect (you burn more calories digesting it).
For a 180lb person dieting, 150–200g per day is the target.
General Health and Maintenance
1.2–1.6g per kg of bodyweight (0.55–0.73g/lb)
You don't need to eat like you're prepping for a bodybuilding show to be healthy. But eating significantly under this range — especially as you age — accelerates muscle loss.
Adults Over 50
1.2–2.0g per kg of bodyweight (0.55–0.91g/lb)
Protein needs increase with age due to anabolic resistance (your body becomes less efficient at using protein for muscle building). Older adults who eat at the lower end lose muscle faster and recover from illness or injury more slowly.
The Per-Pound Shortcut
If you want to skip unit conversions: aim for 0.7–1.0g per pound of bodyweight, with the higher end during fat loss phases. This overestimates slightly for very heavy or very tall individuals, but the error is small and the simplicity is worth it.
For a 150lb person: 100–150g per day. For a 200lb person: 140–200g per day.
Timing: Less Important Than Total
The "anabolic window" of needing protein within 30 minutes of training is largely myth. What matters for muscle protein synthesis is total daily protein and reasonable distribution across meals.
Research suggests 3–5 meals containing 20–40g of protein each produces slightly better results than the same total in 1–2 huge meals. But "slightly better" is the key phrase. If your lifestyle makes 2 meals a day work, hit your total and move on.
One meaningful timing consideration: consuming 30–40g of protein within a few hours of training supports recovery. This doesn't need to be a shake — a meal works fine.
Protein Sources That Actually Work
The highest-quality, most practical sources:
Animal proteins (complete amino acid profile):
- Chicken breast — 25g per 100g
- Lean beef — 26g per 100g
- Greek yogurt (plain, non-fat) — 10g per 100g
- Eggs — 6g per egg
- Cottage cheese — 11g per 100g
- Whey protein — 20–25g per scoop
Plant proteins (often need combining for complete profile):
- Tofu — 15g per 100g
- Tempeh — 19g per 100g
- Lentils — 9g per 100g cooked
- Chickpeas — 9g per 100g cooked
- Seitan — 25g per 100g
Vegans and vegetarians can absolutely hit high protein targets — it just requires more planning and typically more total food volume. Aim toward the higher end of ranges since plant protein is slightly less bioavailable.
Practical Ways to Hit Your Target
Most people underestimate their protein intake by 20–30%. The biggest gaps are usually breakfast and snacks.
A simple framework:
- Every meal should contain 25–40g of protein. Build meals around a protein source first, then add carbs and vegetables.
- Use Greek yogurt, cottage cheese, or a shake as a snack. These are 20–30g of protein with minimal effort.
- Front-load your day. If you wait until dinner to eat protein, you'll fall short. Breakfast with eggs or yogurt is the single easiest change most people can make.
- Keep frozen pre-cooked protein on hand. Frozen chicken strips, pre-cooked lentils, canned tuna. Removes friction on lazy days.
If tracking feels overwhelming, estimate for two weeks until your eye for portion sizes improves. After that, most people can maintain target intake by habit.
When More Protein Doesn't Help
Beyond 2.2g per kg, additional protein doesn't build extra muscle in healthy adults. It's not harmful for healthy kidneys — the "protein damages kidneys" claim has been repeatedly debunked for people without pre-existing kidney disease — but you're displacing carbs or fat that would serve you better.
Exceptions exist. Very lean individuals in aggressive cuts may benefit from intakes closer to 3g/kg to preserve muscle. Bodybuilders during competition prep sometimes push higher. For 95% of people, staying within the 1.6–2.4g/kg band is optimal.
The Bottom Line
- Muscle gain: 1.6–2.2g/kg (0.73–1.0g/lb)
- Fat loss: 1.8–2.4g/kg (0.82–1.1g/lb)
- General health: 1.2–1.6g/kg (0.55–0.73g/lb)
- Distribute across 3–5 meals. Timing around workouts matters less than total.
- Prioritize complete, high-quality sources. Vegans need to eat slightly more and vary sources.
If you're new to tracking, start with one meaningful change: add 30g of protein to breakfast. That alone closes most people's gap.
Coachbase builds personalized training and nutrition programs that adapt to your goals, schedule, and progress. If you want protein targets calculated for your bodyweight and training phase — along with everything else — start your free program.