Vitamins fall into two broad categories: water soluble and fat soluble. This property determines the pattern of transport excretion and storage within the human body.
Vitamins A, D, E and K are lipid like molecules that are soluble in lipid materials. In general, the vitamins carried in the blood by protein carriers are stored in fat tissues, are needed in periodic doses and are more likely to be toxic when consumed in excess of need.
Intestinal cells absorb fat soluble vitamins along with dietary fat, the amount absorbed typically varies from 40 to 90 percent of the amount consumed; efficiency of absorption generally falls as the dietary intake rises above the body’s needs.
Once absorbed, these vitamins are stored in the liver and a fatty tissues until the body needs them.
Fat soluble vitamins play diverse roles in the body, Vitamin A and D may act somewhat like hormones, directing cells to convert one substance to another while vitamin flows throughout the body, preventing oxidative destruction of tissues. Vitamin K is necessary for blood to clot.
Fat soluble vitamin
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