Alcoholic beverages primarily consist of water, pure alcohol (chemically known as ethanol), and variable amounts of sugars and carbohydrates; their content of other nutrients, proteins, vitamins, or minerals is usually insignificant. Because they provide almost no nutrients, alcoholic beverages are considered “empty calories.” One gram of alcohol contains 7 calories compared to 4 calories per gram of proteins and carbs, and one gram of fat contains 9 calories.
These are 7 hollow calories from one gm of alcohol because the body never uses them.