Whereas protein and carbohydrate have only four calories per gram, fat has nine calories per gram. Food labels have been modified recently to help make it easier for the consumer to know what's in a particular food. Although it is important to watch both calories and fat grams, one's focus needs to be on the total number of calories consumed, which often seems to be forgotten. Instead, many are either staying at the same weight or even gaining weight. Yes, you can eat more of these foods than their full-fat versions for the same number of calories.
Any unused energy is converted and stored as excess body fat.
Rolfes, SR and EN Whitney.