If he actually said it had to be after a workout, then he's wrong and dumb. Digestion doesn't stop and start around working out. I don't understand why people think a workout is some kind of isolated entity that changes the body. Everything done -- eating, drinking, shitting, walking, etc. engages so many different parts of the body that they all have an effect. When someone starts talking about hard and fast rules for weight loss/gain or strength/speed or what have you they always end up looking like fools because they can't see the forest for the trees. The post-workout window is a timeframe in which in the body recovers. Nutrients in the bloodstream from previous meals can be sufficient and the idea that a person needs to blast their body with protein and such after a workout is just wrong. Well, what does your PWO nutrition look like? It's like you're just picking the most controversial stance, for whatever reason. As you know, the muscles are depleted of carb and protein stores PWO and are primed for nutrient uptake. Why not take advantage of this period? While I don't agree that there is some magical 30 minute window, the foundation is legitimate. And unless you have a study that says otherwise, I'll continue with my current PWO protocol.