Calories <!-- google_ad_client = "ca-pub-2327677141881672"; /* Short title Links */ google_ad_slot = "3055805829"; google_ad_width = 468; google_ad_height = 15; //-->

Calories are a unit representing the energy provided by food. Carbohydrate, protein, fat and alcohol provide calories in the diet. Carbohydrate and protein have 4 calories per gram, fat has 9 calories per gram, and alcohol has 7 calories per gram.