Nutrient Timing: What Actually Matters - and What You Can Stop Worrying About
The "anabolic window" is mostly myth. But some nutrient timing principles - particularly around protein and carbohydrates - do have meaningful evidence behind them.
The Myth of the Anabolic Window
For two decades, sports nutrition guidance emphasised consuming protein within 30-60 minutes of training - the so-called "anabolic window." More recent meta-analyses, including a comprehensive 2013 analysis by Schoenfeld and Aragon, found that total daily protein intake was far more predictive of muscle protein synthesis than timing. The window is real but much wider than originally claimed - several hours on either side of training.
What Timing Actually Influences
- Pre-workout carbohydrates: For sessions over 60 minutes, consuming 30-60g of carbohydrates 1-2 hours before training measurably improves endurance and high-intensity performance. For sessions under 60 minutes at moderate intensity, this matters much less.
- Post-workout protein: 20-40g of complete protein within 2 hours of training does accelerate muscle protein synthesis - particularly when you trained fasted or your previous meal was 4+ hours ago.
- Evening carbohydrates: Contrary to old advice, carbohydrates in the evening do not produce more fat storage than daytime. Total daily caloric balance determines fat storage, not meal timing in isolation.
- Pre-sleep protein: 30-40g of casein protein before sleep has replicated evidence for increasing overnight muscle protein synthesis - particularly relevant for those with high training volumes.
"Total protein, total calories, and food quality matter far more than when exactly you eat. Timing is the fine-tuning, not the foundation." - Alan Aragon, nutritional scientist
Meal Frequency
The evidence for optimal meal frequency is weak. Three to six meals per day all produce similar outcomes for muscle building and fat loss when calories and protein are matched. Individual preferences, hunger patterns, and lifestyle should guide meal frequency - not a rigid protocol.
Nutrient Timing in Practice
Focus here: hit your total daily protein target (1.6-2.2g/kg) spread across at least 3-4 meals. Eat something with protein in the 2-hour window after hard training. Have carbohydrates available before sessions longer than 60 minutes. Everything else is optimisation you can consider once these foundations are consistent.
