Counts of the number of calories in foods is regulated by various scientific associations around the world. One of the most important is the FDA (Food and Drug Administration) in the United States. The procedure, no matter how simple it may seem, has to follow a lot of rules and evidence. Here we present a condensed version:First split a serving of a food particularly in its three main components: carbohydrates, protein and fat, and weigh each of these parties, then applied the method known as the 4 +4 +9, based on the fact that each gram of 4 produces protein and carbohydrate calories, and each gram of fat 9. So for example, a food that has a gram of each of these components (carbohydrates, protein and fat), shall be deemed to have 17 calories (4 plus 4 plus 9, is equal to 17).
Hence, the FDA allows companies producing food subtract 4 calories per gram of fiber in your product, since according to their formula, fiber helps to discard that percentage of our body.
