Fat

Fat is one of the three main classes of food and, at approximately 38 kJ (9 kilocalories) per gram, as compared to sugar with 17 kJ (4 kcal) per gram or ethanol with 29 kJ (7 kcal) per gram, the most concentrated form of metabolic energy available to humans. (Note that 1 kcal = 1 "Calorie", capitalised in nutrition-related contexts.)

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Vitamins A, D, E, and K are fat-soluble meaning they can only be digested, absorbed, and transported in conjunction with fats. Fats are sources of essential fatty acids, an important dietary requirement.

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They also serve as energy stores for the body. In food, there are two types of fats: saturated and unsaturated. Fats are broken down in the body to release glycerol and free fatty acids. The glycerol can be converted to glucose by the liver and thus used as a source of energy. The fatty acids are a good source of energy for many tissues, especially heart and skeletal muscle.

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KJ: :For the symbol kJ, see kilojoule....

Kilocalories: REDIRECT calorie...

Gram: :For other uses of the words gram or gramme, see gram (disambiguation)....

Fat related Images and Photos (experimental)

Fat Cat	Fat Actress	Run, Fat Boy, Run (BD/WS)	Run, Fat Boy, Run (FS/WS)
Big Fat Liar	Fat Joe: Me Myself & I	Fat Joe: Me Myself & I	One Fat Black Cat
Shawn Colvin: Fat City	Shawn Colvin: Fat City	Chow Yun-Fat	My Big Fat Greek Wedding (DVD)