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The anabolic window (eat protein within 30 minutes of training)

The idea that you must get protein in within 30-60 minutes after lifting or lose your gains does not hold up. When studies match total daily protein, eating it right after training adds no measurable muscle or strength; what matters is how much protein you eat across the day and training hard and consistently.

What the science says

  • Post-workout timing itself builds more muscle Limited evidence

    Schoenfeld, Aragon and Krieger's 2013 meta-analysis of 23 hypertrophy studies found a small apparent benefit of protein timing in a simple pooled analysis, but it disappeared once total protein intake was controlled for. Total daily protein was the strongest predictor of hypertrophy, not when it was eaten.

  • Pre- and post-workout protein work the same Moderate evidence

    In Schoenfeld's 2017 randomized trial, 21 trained men took 25 g of protein either immediately before or immediately after a 10-week full-body program. Strength, muscle thickness and body composition changed similarly in both groups, which argues against a narrow post-exercise window. The trial was small, so it supports rather than settles the point.

  • The window is hours wide, and depends on your last meal Moderate evidence

    Aragon and Schoenfeld's 2013 review concluded that the importance, and even the existence, of a post-exercise window depends on context: if you ate a protein-containing meal a few hours before training, amino acids are still circulating afterwards. The practical window is several hours around the session, not 30 minutes.

What to do instead

Hit your daily protein target and spread it over a few meals; eat a protein-containing meal within a few hours either side of training without watching the clock.

Daily protein (people who lift)About 1.6 g/kg body weight per day; up to 2.2 g/kg is reasonable
Meals3-5 protein-containing meals spread through the day
Around trainingA protein meal in the few hours before or after; no stopwatch needed
Trained fasted (e.g. early morning)Eat protein reasonably soon after, since there is no recent meal covering you
Real driver of growthProgressive overload and enough hard sets per week

Who should be careful

Protein targets on this page are for healthy adults. People with kidney disease or other medical conditions affecting protein intake should follow their doctor's or dietitian's advice rather than these general ranges.

Frequently asked questions

Will I lose gains if I don't eat right after training?

No. A 2013 meta-analysis found no effect of protein timing once total daily protein was accounted for, and a 2017 trial found pre- and post-workout protein gave the same results.

Does post-workout timing matter at all?

Slightly more if you trained fasted, because no recent meal is supplying amino acids. Otherwise the useful window is several hours around the session.

What should I focus on instead?

Your total daily protein (around 1.6 g/kg or more) spread over a few meals, plus progressive overload and enough weekly training volume.

Scientific references

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