Do I need to have protein in the body prior to a workout. This may sound stupid but I don't understand. Protein breaks down within hours, so I'm thinking wouldn't it be good to eat carbs prior to a workout, and maybe protein after a workout. Maybe someone knows when the muscles actually start growing? is it maybe during sleep? If thats the case and you did a 1pm workout, couldn't you start stacking up protein after the workout. I'm also curious as to how long muscle growth lasts for. That could perhaps shed light on when and how to eat protein. I'm sure someones going to tell me if I want to build muscle I need to eat protein all the time. But I'm thinking Protein is generally more expensive.