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Nutrition 2 min read

How Much Daily Protein Supports Muscle and Strength Gains

Research suggests around 1.6 g of protein per kilogram of body weight per day maximizes muscle gains from resistance training, with little extra benefit from higher intakes.

Amira Cole Programming editor·
Fit adult rowing a dumbbell in a modern gym beside protein-rich food and a shake.
On this page · 2 sections
  1. What the Research Shows
  2. Does Eating More Than 2 g/kg Help?

For people who train with weights, current evidence points to a protein intake of roughly 1.6 g per kilogram of body weight per day as the level at which muscle and strength gains from resistance training level off. Eating more protein beyond that ceiling adds little measurable muscle for most adults, making this a practical daily target for hypertrophy-focused programs.

What the Research Shows

A large meta-analysis reviewed 49 studies covering 1,863 participants and found that extra protein boosted strength, fat-free mass, muscle fiber size, and thigh cross-sectional area during resistance training. The response to added protein was stronger in younger, trained lifters and weaker in older trainees.

Younger and older adults resistance training in a gym near a scale and protein foods.

The most useful ceiling emerged clearly: once total daily protein passed about 1.62 g/kg, additional intake produced no further gains in fat-free mass. A separate review confirmed that people under 65 benefit from roughly 1.6 g/kg/day or more during resistance programs, while adults 65 and older see meaningful lean-mass support in the 1.2 to 1.59 g/kg/day range.

Does Eating More Than 2 g/kg Help?

Some trials have tested very high intakes, even up to 4.4 g/kg/day. Across those studies, the extra muscle returned beyond approximately 2 g/kg was small to negligible for most people. Doubling intake rarely doubles the result.

Athlete preparing balanced protein meals in separate containers beside a kitchen scale.

Practical Daily Targets

  • Most training adults: aim for about 1.6 g/kg/day as a sensible, evidence-based target.
  • Older adults (65+): 1.2 to 1.59 g/kg/day supports lean-mass gains when paired with resistance work.
  • Experienced lifters: may benefit at the higher end of this range, but gains beyond ~2 g/kg are typically minimal.

Putting It Into Practice

  1. Calculate target grams using your body weight in kilograms.
  2. Spread protein across meals rather than loading it into one sitting, which can improve daily muscle protein balance.
  3. Prioritize total daily intake and consistent resistance training before fine-tuning supplements.

Focus on hitting your daily protein target consistently, train progressively, and let recovery and sleep support the rest. The routine, not extremes, is what drives long-term muscle and strength results.

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