The supplement industry spent about two decades convincing people that a protein shake had to be consumed within 30 minutes of training or the session was wasted. The “anabolic window” concept moved from niche bodybuilding forums into mainstream gym culture fast enough that people who were barely hitting 80g of protein per day were stressing about sipping whey on the walk to the car.
The research does not support that level of urgency. Studies looking at protein timing have generally found that total daily protein intake has a far greater effect on muscle protein synthesis than the specific window in which it’s consumed. The window, to the extent it exists at all, appears to be several hours wide - not a narrow 30-minute slot.
The Problem With Jumping to Timing
Most people who ask about protein timing are already under-eating protein by a meaningful margin. The UK and US dietary reference values sit around 0.8g per kilogram of bodyweight - a figure set to prevent deficiency in sedentary adults, not to support someone training three to five times per week. For people actively trying to build or maintain muscle, the evidence points to something closer to 1.6–2.2g per kilogram as a more appropriate target.
If you’re a 75kg person eating 90g of protein per day and you start worrying about whether your post-training meal hits within the hour, you’re polishing the edges of a picture that hasn’t been painted yet. Fix the total first.
Distribution Matters More Than Timing
Once total intake is reasonable, distribution across meals does actually matter - though again, not in the precise way people assume. There’s reasonable evidence that spreading protein across three to four meals produces better outcomes for muscle protein synthesis than eating the same total in one or two large meals. Each meal being somewhere in the 30–50g range for most adults seems to be a useful working target.
This isn’t about optimising to the gram. It’s about not eating 15g at breakfast, 20g at lunch, and trying to cram 80g into dinner and calling it balanced.
One Genuinely Useful Rule
Eat something with meaningful protein content within a couple of hours before or after training. Not because the window slams shut, but because training sessions are a reliable anchor point in most people’s days, and using them to build a habit around protein intake is practical.
That’s the level of complexity this actually requires. Whether you’ve eaten chicken at 1pm or 2pm on a given Tuesday is not what your results are hinging on.