protein has 4 calories per gram...carbs have 4 calories per gram and fat has 9 calories per gram. Someone posted that alcohol has 7 calories per gram....when you consume alcohol, your body stops working on the proteins fats and carbs until all of the alcohol is gone from your system. It sees the alcohol as a poison and removes it entirely then goes back to normal. That is why almost all diets say NO ALCOHOL......... or VERY moderate consumption.