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VITAMINS: INTRODUCTION AND SOME DEFINITIONS
Undoubtedly the discovery of vitamins in the twentieth century will go down in history as one of the major factors in the improvement of health of people throughout the world. The fact that these substances in such small amounts affect the course of health in so many ways has also led to widespread abuse of them. Many people, lacking full understanding of how vitamins function, place emphasis upon vitamin intake from one source or another, while ignoring other equally important nutrients. Other people somehow expect that a vitamin pill will solve many nutritional problems.
Definitions
Vitamins are chemical compounds of an organic nature that occur in minute quantities in foods and are necessary for life and growth. Many, but not all, are components of enzymes. As enzymes they facilitate the use of the energy nutrients. Vitamins are important regulators of the synthesis of countless body compounds.
Vitamins are generally classified as fat-soluble and water-soluble. But within each of these broad classes the vitamins differ in their chemical structure, their distribution in foods, and in their functions. Moreover, each vitamin deficiency is specific in its characteristics.
Precursors or provitamins are compounds that can be changed into the active vitamin.
Avitaminosis means “without vitamins.” It denotes a deficiency or lack of sufficient vitamin to carry out normal body functions. Some deficiencies are so mild that a diagnosis can be made only by biochemical tests of the blood and urine. As deficiencies become more severe, clinical signs typical of the specific vitamin lack begin to appear.
Hypervitaminosis is an excessive accumulation of a vitamin in the body leading to toxic symptoms. Excessive intakes of vitamins A and D can be toxic.
Vitamin antagonists or antivitamins are substances that interfere with the functioning of a vitamin.
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