How Much Protein Do You Actually Need? Evidence-Based Targets by Goal

The official RDA for protein is 0.8g/kg bodyweight per day. This figure defines the minimum intake sufficient to prevent nitrogen deficiency in sedentary adults. It is not a target for optimal health, muscle preservation, or body composition. Applying it to anyone who trains or eats in a caloric deficit produces systematically insufficient protein intake.

What Protein Targets Are Based On

Protein requirements vary by:

• Training status and goal (resistance training increases muscle protein turnover, raising dietary protein demand)
• Caloric context (in a deficit, dietary protein also covers gluconeogenic demand; the requirement rises)
• Body composition (leaner individuals have a higher lean-to-total-mass ratio; requirement scales with lean mass)
• Age (older adults exhibit "anabolic resistance" — blunted mTOR and MPS responses per gram of protein — requiring higher per-meal and daily protein to achieve equivalent muscle protein synthesis)

Evidence-Based Targets

Sedentary adults (maintenance, no training): 1.0–1.2g/kg bodyweight. Modestly above the RDA, which underestimates requirements even in sedentary individuals when protein quality is accounted for.

Recreational resistance trainees (muscle maintenance + general health): 1.6–2.0g/kg bodyweight. The Morton et al. (2018) meta-analysis found the dose-response plateau for muscle mass accretion at approximately 1.62g/kg/day — no aggregate benefit beyond this threshold. That is the mean; individual variation exists.

Active fat loss / caloric deficit: 2.0–2.5g/kg bodyweight. Higher protein in a deficit serves anti-catabolic functions alongside anabolic ones. Helms et al. (2014) recommended 2.3–3.1g/kg fat-free mass for lean, resistance-trained athletes in deficit.

Older adults (60+): 1.6–2.2g/kg bodyweight. Anabolic resistance raises the effective threshold — the MPS response to a given dose is blunted, and higher intakes partially compensate.

> 📌 Morton et al. (2018), meta-analyzing 49 RCTs, found the dose-response relationship between protein intake and lean mass gain plateaued at 1.62g/kg/day (95% CI: 1.03–2.20g/kg). Beyond this, additional protein produced no significant lean mass benefit in aggregate — though the upper confidence interval suggests some individuals may benefit from higher intakes. [1]

Per-Meal Leucine Threshold

Daily totals matter, but so does per-meal dose:

• Each protein meal needs approximately 2–3 g (0.1 oz) of leucine to maximally stimulate mTOR and muscle protein synthesis
• This typically requires 25–40 g (1.4 oz) of protein per meal from quality sources (whey, chicken, fish, eggs)
• Distributing protein across 3–5 meals at an adequate per-meal dose outperforms concentrating it in 1–2 large meals

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