Protein is the most satiating macronutrient, has the highest thermic effect (burns ~25% of its calories in digestion), and is essential for muscle retention during fat loss. Getting enough is one of the highest-leverage nutritional decisions you can make.
Protein Targets by Goal
- •Sedentary adults (minimum): 0.36g per pound of body weight (RDA)
- •Active adults / general health: 0.6–0.8g per pound of body weight
- •Fat loss (preserve muscle): 0.8–1.0g per pound of body weight
- •Muscle building: 0.7–1.0g per pound of body weight
- •Example: 180 lb person → 130–180g protein/day for muscle building
Use Your Lean Body Mass for Precision
If you're significantly overweight, targeting 1g per pound of total body weight sets too high a calorie requirement. Instead, use lean body mass: bodyweight × (1 - body fat%). A 220-lb person at 30% body fat has ~154 lb of lean mass → aim for 130–150g protein.
High-Protein Foods Ranked by Protein per Calorie
- •Chicken breast: 31g protein per 165 calories (highest ratio)
- •Canned tuna: 25g protein per 110 calories
- •Greek yogurt (plain, 0%): 17g per 100 calories
- •Cottage cheese: 14g per 100 calories
- •Eggs: 6g per 70 calories
- •Lentils: 18g per 230 calories (best plant source)
- •Protein powder: 25g per 120 calories
Spread protein across all meals rather than concentrating it in one. Research shows muscle protein synthesis is maximized at 0.4–0.55g per pound per meal. For a 180-lb person, that's 25–40g protein per meal, 4–5 meals/day.
If you do nothing else nutritionally, hit your protein target. It preserves muscle during fat loss, reduces hunger, speeds metabolism, and is harder to overeat than fat or carbs. Most Americans eat only 50–70g/day — likely half of what they need.
Frequently Asked Questions
How much protein do I need per day?
The RDA for protein is 0.8g per kilogram of body weight — a minimum, not an optimum. For active adults aiming to maintain or build muscle, research supports 1.6–2.2g per kg (0.7–1.0g per lb). A 150 lb active person should target 105–150g protein daily. Older adults benefit from the higher end of this range to combat age-related muscle loss.
Calculate your protein target →Does eating more protein actually help build muscle?
Yes, up to a point. Muscle protein synthesis is maximized at around 1.6–2.2g/kg/day when combined with resistance training. Above 2.2g/kg shows diminishing returns for most people. Without resistance training, extra protein alone doesn't build muscle — it either gets used for energy or excreted. Protein + progressive overload = muscle growth.
Is eating too much protein dangerous?
For healthy people with normal kidney function, high protein diets (up to 3.0g/kg/day) appear safe in research. The kidney concern applies to people with pre-existing kidney disease — consult a doctor if you have kidney issues. High protein diets sometimes crowd out fiber-rich carbs, so pair protein increases with more vegetables and whole grains.
What are the best high-protein foods?
Animal sources: chicken breast (31g/100g), Greek yogurt (10g/100g), eggs (13g/100g), cottage cheese (11g/100g), tuna (30g/100g), salmon (25g/100g), lean beef (26g/100g). Plant sources: lentils (9g/100g cooked), edamame (11g/100g), tofu (8g/100g), tempeh (19g/100g), black beans (9g/100g). Animal proteins are 'complete' (all essential amino acids); plant proteins often need pairing.
Do I need to eat protein immediately after a workout?
The 'anabolic window' (30-minute post-workout rush) is largely overstated by modern research. What matters most is total daily protein intake spread across 3–5 meals/snacks. If you worked out fasted or haven't eaten in 4+ hours, a post-workout protein source helps. Otherwise, just eating enough protein throughout the day is sufficient for muscle recovery and growth.