The term "fat percentage" refers to the proportion or amount of fat in relation to other components such as water, protein and carbohydrates in a particular food item. It is usually expressed as a percentage of the total weight of the food. For example, if a food has 5 grams of fat out of every 100 grams of that food, then its fat percentage would be 5%. Fat percentages are important for people who are monitoring their dietary intake or trying to maintain a healthy lifestyle as it helps them keep track of the amount of fat they consume.