It might be high in calories, but that’s not the be all and end all. After losing water during exercise, a moderate beer intake has no negative effects on the ability of healthy individuals to hydrate, according to research published in the Journal of the International Society of Sports Nutrition. 660ml is considered the sweet spot (that’s a pint and a couple of gulps of your mate’s while he’s in the toilet). Any more than that and the body’s ability to rehydrate is negatively affected.