Alcohol provides 7 calories per gram, but it provides no essential nutrients. a 1.5 ounce serving of 80-proof liquor contains100 calories in alcohol alone. sweet wines and beer provide additional calories since they also contain carbohydrates. about 75 percent of american adults drink some sort of alcoholic beverage, which adds an average of 210 calories a dayto their diet. determine how many pounds less an average american adult will weigh per year if he or she quit drinkingalcoholic beverages and started drinking diet soda.