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Poor nutrition is the leading cause of immune deficiency in the elderly and is surprisingly common, even among those who live independently and have no chronic diseases.
The foods we eat influence specific acquired immunity, which declines with age, as well as nonspecific innate immunity. "Food should be thought of in a proactive, immune-enhancing way," Dr. John La Puma said at a conference in Chicago on alternative and complementary medicine sponsored by the University of Chicago.
Specific immunity is responsible for targeting specific microorganisms. A person who is deficient in zinc, for example, is thought to be more susceptible to infectious diseases because of decreased production of interferon-[gamma] and interleukin-2 and decreased activity of natural killer cells (J. Infect, Dis. 182[suppl. 11562-568, 2000).
This component of the immune system is the one that is the most amenable to improvement through nutrition, said Dr. ...