I know carbs are important to muscle building, particularly pre and post workout to replenish stores and what not. My question is, are they just as vital all the rest of the time? If for example I ate carbs on workout days, and filled my off days with primarily protein and fat, would that be detrimental to building muscle. basically, are carbs essential on recovery days, provided I maintain adequate calories through protein and fat. Or is it vital on those days but in smaller amounts?