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The role of trace elements in human nutrition is only beginning to be understood, especially as it pertains to the elderly. These elements, each of which constitutes less than 0.01% of total- body weight, have diverse physiologic functions, a number of which could theoretically be influenced by the normal aging process.
Currently, 16 trace elements are thought to be biologically important in metabolism and nutrition. The Food and Nutrition Board of the National Research Council has established a recommended daily allowance (RDA) for only three of these—iron, zinc, and iodine. These are discussed in the first part of this article. The second part, beginning on page 251, deals with trace elements for which the board has suggested a safe and adequate daily dietary intake (SADDI)—copper, manganese, selenium, chromium, molybdenum, and fluoride.