If you go on social media for ten seconds, someone is yelling at you to eat more protein. If you read a government nutrition guide, the number is much lower. So who’s right?
Short answer: somewhere in between, and the right number depends on what you’re actually trying to do. Here’s a clean breakdown without the marketing.
The two reference numbers
The RDA (Recommended Dietary Allowance) for protein is 0.8 g per kg of body weight per day. The RDA is the minimum to prevent deficiency in nearly all healthy adults. It is not, and was never intended as, an optimum for performance or body composition.
Sports-nutrition research consistently lands in the 1.2–2.2 g/kg/day range for active people, with the upper end recommended for those actively trying to build muscle or losing weight while preserving muscle.
Convert to pounds: divide kg numbers by 2.2.
Pick the row that matches your goal
| What you want | Target protein |
|---|---|
| Sedentary, just healthy | 0.8–1.0 g/kg (≈ 0.36–0.45 g/lb) |
| Recreational exercise, maintenance | 1.2–1.6 g/kg (≈ 0.55–0.73 g/lb) |
| Building muscle (lifting + eating in surplus) | 1.6–2.2 g/kg (≈ 0.73–1.0 g/lb) |
| Losing fat, preserving muscle | 1.8–2.4 g/kg (≈ 0.82–1.1 g/lb) |
| Older adults (60+) | At least 1.2 g/kg, evenly distributed across meals |
The reason the cutting/fat-loss row is highest: when you’re in a calorie deficit, protein is what prevents your body from breaking down its own muscle for fuel. More important here than during muscle gain.
Distribution matters
A handful of studies suggest that hitting your daily total isn’t quite as good as hitting it in 3–5 doses of roughly equal size spaced through the day. Each dose of ~20–40 g of complete protein maximally stimulates muscle-protein synthesis; bigger doses don’t add much, smaller ones leave value on the table.
In practice: instead of 80 g at dinner and 10 g at breakfast, aim for 30–40 g at each main meal.
Real-food sources, ranked roughly by efficiency
- Chicken breast: ~31 g per 100 g cooked
- Greek yogurt (plain, full-fat): ~10 g per 100 g
- Cottage cheese: ~12 g per 100 g
- Eggs: ~6 g each
- Lean beef: ~26 g per 100 g cooked
- Tofu: ~8 g per 100 g
- Lentils (cooked): ~9 g per 100 g
- Whey protein powder: ~24 g per scoop
You can absolutely hit these targets from food. Powders are convenience, not magic.
When powder makes sense
If you’re tracking and you’re consistently short ~20–40 g/day, a single scoop solves it. A basic unflavored whey protein mixes into oatmeal, coffee, or water; flavored versions taste better but cost more and have more additives. Whichever you pick, the math is the same — it’s just protein in a bag.
What to ignore
- “You can only absorb 30 g at a time.” Wrong. You’ll digest larger doses fine; you just won’t get extra muscle-synthesis benefit past ~40 g per meal.
- “Plant protein is incomplete.” Individual plant sources can be lower in certain amino acids, but a normal varied diet easily covers everything. If you eat a mix of legumes, grains, soy, and nuts, you’re fine.
- “More than 2 g/kg damages your kidneys.” Not in healthy kidneys, per current research. If you have kidney disease, talk to your doctor first.
The honest bottom line
For most adults trying to look and feel better, aim for 1.6–2.0 g/kg/day (roughly 0.7–0.9 g/lb) and don’t overthink the rest. The compound effect of doing that consistently for a year matters more than the perfect macro split on any given Tuesday.