Do you need to eat protein right after training?
No. Total daily protein matters far more than getting it into some 30-minute post-workout slot, and the practical window is several hours wide, not minutes.
The “anabolic window” is one of the stickiest ideas in gym culture: train hard, then get protein in within 30 to 60 minutes or you waste the session. It’s a tidy story, and it sold a lot of ready-to-drink shakes. The problem is that the narrow version doesn’t hold up.
Start with what your muscles actually do. A hard resistance session raises muscle protein synthesis and keeps it elevated for roughly 24 hours or more. Across that stretch, your muscles stay primed to use the protein you eat. The ISSN’s nutrient-timing position stand puts it plainly: muscles remain sensitized to protein for at least 24 hours after training. That’s a barn door, not a keyhole.
What actually drives the result
When researchers pooled the timing studies in a 2013 meta-analysis, post-workout protein did look like it helped, until they accounted for how much protein people ate across the whole day. Once total intake was matched, the timing effect essentially vanished. A later meta-analysis of 49 trials pointed the same way: gains tracked total daily protein, with benefits plateauing around 1.6 g per kg of bodyweight, and timing and protein source as minor players. And when trained lifters took 25 g of protein either right before or right after training for 10 weeks, their strength and size gains came out the same.
The one caveat worth keeping
Timing isn’t literally irrelevant, it’s just wider and gentler than advertised. If you train fasted, say first thing in the morning with nothing since dinner, your body has already gone many hours without protein, so eating within a couple of hours on either side of the session makes sense. That’s not a 30-minute alarm; it’s just not going 8-plus hours around a workout on empty.
Practical takeaway: hit your daily protein target, very roughly 1.6 to 2.2 g per kg of bodyweight spread over a few meals, and stop watching the clock after your last set. If you ate within a few hours before training, or you’ll eat within a few hours after, you’re already inside the window. It’s that forgiving.