Why alcohol contains calories??
Alcohol contains calories in the form of energy. In ethanol this energy is in the form of the bond of the hydroxyl group (OH) and the 2-carbon substrate. When the bond is cleaved energy is released. This energy is measured in Kcal units. People become fat from excess consumption of calories weather those calories are from food sources or alcohol. When consumed together the energy from alcohol is easily and rapidly metabolized by the human body. Thus other calorie sources are often stored as fat. In the case of mixed drinks other sources of calories are introduced such as simple sugars.