Nutrition and Your Immune System
The ability of the immune system to fight disease declines with age. As it does, the incidence of infections, cancers, and autoimmune diseases increase and the effectiveness of immunizations decline. In turn, the presence of infections and chronic disease contributes to malnutrition.
Nutrient deficiencies are common in older adults, including deficiencies of zinc, iron, beta-carotene, folic acid and vitamins B6, B12, C, D, and E. Supplements of some of these individual nutrients have been shown to increase certain aspects of the immune response, but have not been shown to reduce mortality from infections. High doses of some nutrients, including zinc, copper, and iron, depressed immune function, so supplement should not contain more than 100% of the daily value. There is little evidence that “megadoses” (over the Daily Value) of any vitamin or mineral is necessary for optimum health.