Fat is solvent transport (carrier) of fat-soluble vitamins (such as vitamins A, D, E and K). The body of this vitamin in large part depend on the amount of fat in food. That means that when fat in the diet will lead to reduced low absorption of this vitamin. This makes the fat becomes more important because of the fat-soluble vitamins have an important role for visual function, ability immune response, hematopoiesis, growth and anti-aging, ... in processed foods, fat serves delicious flavor, feeling fuller longer. The basic unit of lipids are fatty acids. Structurally, the fatty acids are divided into two groups, saturated fatty acids and unsaturated fatty acids. The saturated fatty acids including palmitic acid common, stearic acid, acid caprilic, mainly lies in the composition of animal fats, have low biological value than the unsaturated fatty acid. The common unsaturated fatty acids including oleic, elaidic (one double bond), linoleic (2 double bonds), alpha linolenic acid (3 double bonds) or arachidonic (4 double bonds). The unsaturated fatty acids have 2, 3, or more than double circuit with the strongest biological activity, such as arachidonic acid have biological activity 2-3 times higher than linoleic acid. However, linoleic acid can be converted to arachidonic acid, linoleic acid content so that the most important criteria to evaluate the biological value of the fat.
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