Research into vitamins E and C, both antioxidants, may lead to new RDAs for the elderly one day. Vitamin E has shown a positive effect on the immune system in research at the USDA Center. Whether vitamin E stimulates the immune system or prevents its decline is unclear. An increased chance of developing cataracts has been associated with low vitamin C intakes in research at the USDA Center. Vitamin C's antioxidant properties may ward off potential damage by ultraviolet light, but the conclusion cannot yet be drawn.
Poor nutrition can have stark consequences for the elderly.
Aging is generally associated with decline of the immune response, which may be linked with a cumulative, marginal deficiency of trace metals and vitamins, according to Gabriel Fernandes, Ph.D., at the University of Texas. Of particular interest are zinc, B vitamins, iron and other trace metals. Medications for chronic disease can affect drug-nutrient interaction, as well. These and other emerging ideas lead many to call for more definitive research into the nutritional needs of the elderly. Elderly on low, fixed incomes are at greater risk of malnutrition.