The Nutritional Application of Vitamins to Human and Animal Health |  |
Chapter Summary| A brief review of the principal roles, sources, and clinical deficiency symptoms of the fat- and water-soluble vitamins has been presented. Research leading to the identification and importance of vitamins is primarily a contribution of the twentieth century.
Some essential vitamins are stored in considerable quantities within the body during periods of adequate intake. These stores are drawn on later to meet requirements during periods of shortage. Others must be supplied regularly because storage in the body is limited. Moreover, there is a considerable variation of vitamin needs among species. Some species can synthesize adequate quantities of certain vitamins within their bodies. Additional research is needed to determine the exact requirements for various vitamins and vitamin-related compounds in many species |
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2003 McGraw-Hill Higher Education