Anabolic window

The 'anabolic window' refers to a once-popular idea that protein consumed within 30 to 60 minutes after a workout produces dramatically better muscle gains than protein eaten outside that window. The concept gained traction in the late 1990s based on small studies showing elevated muscle protein synthesis immediately after training. Supplement marketing latched onto it and sold the idea that missing this window would 'kill your gains.' Modern evidence has narrowed the window dramatically. A 2017 meta-analysis by Schoenfeld and Aragon, covering 23 studies, found that as long as you eat your daily protein target and consume protein within roughly 4 to 6 hours around training, hypertrophy outcomes are statistically the same as immediate post-workout intake. The total daily protein matters far more than the exact minute of consumption. The exception is fasted training. If you train fasted in the morning, eating protein soon after is sensible because muscle protein breakdown has been elevated for hours. For everyone else, the practical advice is simple: hit your daily target across 3 to 5 meals, time one meal somewhere within a few hours of your workout, and stop stressing about the timer. Use the protein calculator to set the daily target — that is the variable that actually moves the needle.