well i think the general consensus, is that when on gear a lot more of the nutrients go towards building muscle. This happens through a lot of different pathways a couple of which are increased prot sysnthesis and increased anabolism. Anyway there are to many to mention plus we actually dont really know what happens when the body is on gear.
But generally people on gear eat lots more protein. And i mean lots more 400 gr is not exceptional. Also try eating complex carbs with every meal.
Well anyway i dont know why im ranting on anyways, cause i have no experience on gear its just hear say what im typing here anyway hope i helped