Do fats, carbohydrates, protein and alcohol all have the same number of calories per gram?
No. Fat is the most expensive calorically at nine calories per gram; next is alcohol at seven calories per gram. Carbohydrates and protein both have four calories per gram. Total calories are nothing more than a combination of the fats, carbohydrates and protein in a particular food. So, if a food has 1 gram of fat (nine calories), 2 grams of carbohydrate (eight calories), and 1 gram of protein (four calories), it should have about 21 total calories. Is it true that whole milk has only about 3 percent fat? Yes. The fat-percentage figures refer to how much of the milk’s total weight comes from fat. Whole milk is about 88 percent water, 3.25 percent protein and 5.25 percent lactose (milk sugar), according to Christine Bruhn, a professor of Food Science at the University of California, Davis. It’s about 3.25 percent fat on average, and therefore about 96.75 percent fat free. However, that doesn’t mean there aren’t tremendous calorie differences among types of milk. Whole milk (1 cup): 150
