Assuming you’re talking about post-workout, protein is required to repair the micro-tears to your muscles that occurs. [edit: It’s also through this repair process that the muscles gain bulk]. If you don’t have sufficient protein it will slow recovery AND reduce the ability to put on muscle bulk. If you eat more protein than is required it will just be used as a source of energy, but you err on the side of more to ensure minimal workout effort goes to waste.
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