Fat

Fat is one of the three kinds of energy-giving foods in the diet. Fats are an extremely rich source of energy, with a calorie content of 9 calories per gram. This is more than twice as much as provided by proteins and carbohydrates. The most common fat-containing foods are butter, cream, eggs, fatty meats, margarine, oily fish, and vegetable oils. Most fats are burned to produce energy. Other fats become an essential part of cells. Fats that are not required immediately as a source of energy are stored in layers of fatty (adipose) tissue under the skin. They are available as fuel for energy at any time. The stored fats surround and protect internal organs, such as the kidneys, and act as insulation that prevents heat loss. Certain "essential" fatty acids are required for normal metabolism and health and can only be supplied in the diet: Omega 3, Omega 6 and Gamma Linoleic Acids. Fats also provide an environment in which vitamins A, D, E, and K can dissolve.