Nutrient Timing
Nutrient timing is the strategic distribution of macronutrient intake across the day — and specifically around training sessions — to maximize muscle protein synthesis, glycogen resynthesis, and performance. Total daily intake is the primary driver of adaptation; timing is a secondary lever that becomes meaningful only when totals are adequate.
Core Principle
Total daily macronutrient intake > timing > specific supplements. An athlete hitting protein and carbohydrate targets at imperfect times will outperform one who optimizes timing on inadequate totals. With totals addressed, timing can provide a measurable additional benefit.
Protein Timing
Per-Meal Dose
Muscle protein synthesis (MPS) is maximized by a protein bolus of 0.25 g/kg body weight per meal, or an absolute dose of 20–40 g, whichever is greater for heavier individuals. Each dose should provide 700–3,000 mg of leucine alongside a complete essential amino acid (EAA) profile to trigger the mTOR signaling cascade.
Meal Frequency
Distribute daily protein intake across 3–5 meals spaced 3–4 hours apart. This spacing allows MPS to return to baseline between meals, enabling each meal to trigger a discrete anabolic response. Consolidating protein into 1–2 large meals or spreading it across 8+ small doses both attenuate the per-day MPS response relative to the 3–5 meal pattern.
Pre-Sleep Protein
Consuming 30–40 g of casein (slow-digesting protein) in the final hour before sleep sustains MPS through the overnight fasting period. Whole food sources (cottage cheese, Greek yogurt) deliver similar effects. This dose is in addition to the daytime distribution, not a replacement for a daytime meal.
Carbohydrate Timing
Around Training
Carbohydrate availability during training preserves glycogen, attenuates cortisol, and sustains high-quality work sets in the final training sets. For sessions longer than 60–90 minutes, intra-workout carbohydrate (30–60 g/hour of rapidly absorbed carbohydrates) maintains performance. For sessions under 60 minutes at moderate intensity, intra-workout carbohydrate is not required.
Post-Training Glycogen Resynthesis
Standard recovery (8+ hours between sessions): glycogen stores restore fully through normal daily carbohydrate intake. No aggressive post-workout window is required.
Rapid recovery (less than 4 hours between training sessions): glycogen resynthesis becomes rate-limiting. The protocol:
| Priority | Target | Notes |
|---|---|---|
| Carbohydrate dose | 1.2 g/kg/hour of high-glycemic carbohydrates (GI > 70) | Sustained for 4 hours; repeat each hour |
| Add protein | 0.2–0.4 g/kg/hour of protein | Co-ingestion augments insulin response and resynthesis rate |
| Add caffeine | 3–8 mg/kg | Accelerates glycogen resynthesis ~66% when combined with carbohydrate |
High-glycemic carbohydrates (white rice, dextrose, sports drinks, white bread) are preferred post-workout for glycogen resynthesis. Low-glycemic choices slow resynthesis and are disadvantageous in the immediate recovery window.
The Post-Workout Window
The "anabolic window" — the idea that a narrow 30-minute period after training is uniquely important — is overstated for most trainees. Pre-workout protein consumption substantially extends the effective window. The practical rule:
- If your pre-workout meal was within 2 hours of training, the post-workout window is not acutely urgent. Consume a normal meal within 2 hours of finishing.
- If you trained fasted (>4 hours since last meal), prioritize a post-workout meal within 30–60 minutes.
Practical Timing Template
| Window | Protein | Carbohydrate | Purpose |
|---|---|---|---|
| 2–3 h pre-training | 0.25 g/kg | 1–4 g/kg (goal-dependent) | Top up glycogen; begin MPS |
| Intra-workout (>60 min sessions) | — | 30–60 g/h fast carbs | Sustain work capacity |
| 0–2 h post-training | 0.25–0.40 g/kg | 1–1.5 g/kg | Initiate recovery |
| Pre-sleep | 30–40 g casein | — | Sustain overnight MPS |
How Systems Differ
- Powerlifting / Strongman: Sessions are intense but relatively short. Pre-workout carbohydrate loading matters for multi-hour competition days. Pre-sleep protein is high value given the heavy mechanical demands.
- Bodybuilding: Contest prep increases the strategic importance of timing because total caloric intake is restricted; each meal's anabolic signal carries more weight when totals are compressed.
- Olympic Weightlifting: Multi-session training days (common at elite levels) make rapid glycogen resynthesis protocols directly relevant.
- CrossFit: Mixed-modal sessions deplete both glycogen and muscle glycogen. Intra- and post-workout carbohydrate are high priority on competition days or back-to-back training days.