Fat Soluble Vitamins
Vitamins are essential
micronutrients required by the body in small amounts to support a variety of important functions. Vitamins are divided into two groups: water-soluble (B-complex vitamins and C vitamins) and fat-soluble vitamins (A, D, E and K). Unlike water-soluble vitamins that require regular replacement within the body, fat-soluble vitamins are stored within the liver and fatty tissues, and are eliminated far more slowly than water-soluble vitamins. For more
information on water-soluble vitamins, see fact sheet. Vitamin A is required for the upkeep of normal mucous membranes and for normal vision. It occurs naturally only in foods of animal origin, like liver, butter,
milk , and egg yolks, but the body converts certain carotenoids, especially β-carotene, to vitamin A . Only 50 of the quite 500 present carotenoids have provitamin A activity. Carotenoids are present in dark-green, leafy vegetables and in yellow and orange vegetables and fruits. additionally, skim milk, margarines, and certain breakfast cereals are fortified with vitamin A . From food composition tables, one can estimate only the entire vitamin activity (vitamin A value) but not the number of specific carotenoids or retinoids in foods . The fat-soluble vitamins, A, D, E, and K, are stored within the body for long periods of your time and usually pose a greater risk for toxicity than water-soluble vitamins when consumed in excess. Eating a traditional, well-balanced diet won't cause toxicity in otherwise healthy individuals. However, taking vitamin supplements that contain megadoses of vitamins A, D, E and K may cause toxicity.
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