Glossary
Protein Timing
Updated February 28, 2026
Protein timing is how you spread protein across the day to support recovery and muscle growth. For daily targets, see The Importance of Protein.
Why distribution matters
Muscle protein synthesis (MPS) is triggered by the leucine content of a meal. Approximately 2.5 to 3 g of leucine per feeding maximally stimulates the mTOR pathway that drives MPS. This corresponds to roughly 0.4 to 0.55 g/kg of high-quality protein per meal (Schoenfeld and Aragon 2018 position stand). Once MPS is maximally stimulated, additional protein in the same meal provides diminishing returns for muscle building, though it still contributes to satiety and total daily intake.
MPS remains elevated for roughly 1 to 3 hours after ingestion of a fast-digesting protein like whey, and longer for slower-digesting sources like whole food meals or casein. Spreading protein across 3 to 5 meals creates multiple MPS peaks across the day rather than a single large peak followed by a long gap.
Practical targets
| Context | Target |
|---|---|
| Per meal | 0.4 to 0.55 g/kg of body weight (approximately 25 to 40 g for most adults). Enough to hit the leucine threshold |
| Daily | 1.6 to 2.2 g/kg total, distributed across meals |
| Pre-sleep option | 30 to 40 g of slow-digesting protein (casein or a whole-food meal). A 12-week resistance training study (Snijders et al. 2015) found greater gains in muscle mass and strength when 27.5 g of casein was consumed pre-sleep compared to a placebo |
Timing priorities
| Priority | Rule |
|---|---|
| Training day | Prioritize a protein-containing meal within 2 to 3 hours before and after training. The "anabolic window" is wider than the popular 30-minute claim. A 2013 meta-analysis (Schoenfeld, Aragon, Krieger) found that total daily protein intake predicted hypertrophy better than proximity to training |
| High workload day | Keep minimum spread over 4 to 5 feed blocks |
| Recovery day | Keep total and spacing stable |
Per meal by body weight band
| Body weight band | Minimum per-meal target |
|---|---|
| Lean, lower weight users | 0.3 to 0.4 g/kg per feed (roughly 20 to 30 g) |
| Mid and high workload users | 0.4 to 0.55 g/kg per feed (roughly 30 to 45 g) |
Diminishing returns and the leucine ceiling
Each additional gram of protein within a single meal produces less MPS stimulus once the leucine threshold is reached. Practically, this means that eating 80 g of protein in one meal and 10 g in the other three produces worse MPS outcomes across the day than distributing 25 to 40 g across four meals, even if the daily total is identical.
| Pattern | Signal |
|---|---|
| Extra protein in one meal with low total | Shift to spread across other meals first |
| Balanced total but repeated early fullness | Keep dose moderate and extend interval |
| High totals with flat performance | Review sleep and carbohydrate context first |
Distribute protein over 3 to 5 meals. Total daily intake is the strongest predictor of outcomes. Distribution fine-tunes results by creating more MPS peaks across the day.