For a bodybuilder, strength athlete or someone trying to optimize lean mass and size, it's a mistake. Here's why. "Hydrate" literally means "with water". Carbo- hydrates bind with water molecules and if carbohydrate intake is sufficient they will carry the water into the muscle cell- (a "volumizing" effect) making them full and round. Insufficient carbohydrates will leave you with smooth, smaller and flat muscles. -Quoting- paraphrasing really, here from "Heavy Duty Journal" by Mr. Universe Mike Mentzer- the first man to ever get a perfect 300 score in international competition on contest preparation and nutrition.