Function Of Fat-Soluble Vitamins   

Function Of Fat-Soluble Vitamins

Vitamin are essential.

Vitamins, although they are required in minute amounts, are essential for growth and reproduction; formation of antibodies; coagulation of the blood; resistance to infection; formation of intercellular substances; and integrity of bones, teeth, skin, blood, and nervous tissue. They also function as coenzymes for innumerable chemical reactions concerned with the metabolism of food, on which the nutrition of the body depends.

Fat-soluble vitamins and their functions.
The fat-soluble vitamins are A, D, E, and K. They are called fat-soluble because they dissolve in fats and excesses are stored in fatty tissues.
Vitamin A is particularly important for normal growth, normal vision in dim light, healthy skin, and it also helps keep the inner linings of the body (epithelial tissue) healthy and resistant to infection. True vitamin A is found only in foods of animal origin, such as liver, eggs and butter.

Provitamin-A or carotene, which can be converted to true vitamin A by the body, is found in dark green and yellow vegetables and fruits, such as spinach, winter squash, peaches, and cantaloupe. Vitamin A is one of the nutrients most commonly lacking in the average diet.
Vitamin D is important for bone development and is essential for the utilization of calcium.

It is called the "sunshine vitamin" because it can be formed in the skin by the action of sunlight.
Few foods contain much vitamin D. Best sources are sardines, salmon, herring, and tuna. However, milk and margarine are commonly fortified with Vitamin D.
Vitamin E is an antioxidant, which means that it prevents rancidity caused by oxidation. It offers protection to the red blood cells in the presence of blood destroying agents and protects vegetables, whole grain foods, and vegetable oils, contain small amounts of vitamin E. To characterize the vitamin, the word "Tocopherol" was coined. While at least four tocopherols have been isolated and named Alpha, Beta, Gamma, and Delta, Alpha is the most potent and is considered synonymous with vitamin E. Natural vitamin E, which is extracted from soya bean oil, Is designated D-Alpha, while synthetic vitamin E is designated DL-Alpha.Vitamin K is a blood clotting factor. In fact, it was originally named Koagulations-vitamin, which was later shortened to vitamin K. The best sources are alfalfa and other green leafy materials.

Since vitamin K can be synthesized by intestinal flora, supplementation is rarely needed. Thus, vitamin K is rarely included in dietary supplements.

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