Key to Longer and Healthier Life

What is the key to living a longer healthier life? William H. Adler, M.D., chief of clinical immunology at National Institute of Aging, believes it is to build up your immune system.
“It’s quite clear in rodents that you can manipulate the life span-both the average life span and the maximum life span- by fooling around with diets,” says James O’Leary, M.D., Ph.D., an assistant professor at the University of Minnesota Medical School. “The major factor is dietary restriction. If you allow rodents to eat what they want, their immune systems decline. If you under nourish the animals (by restricting calories) without them missing any important nutrients, they live longer.”
They also seem to live better, reports Roy I. Walford, M.D., a professor of pathology at the UCLA School of Medicine. In one study he conducted, for example, 50 percent of fully fed mice developed cancers of one sort or another, but only 13 percent of the mice on restricted diets did. Other studies seem to indicate that animals on restricted diets also have fewer cataracts and less dry skin, kidney disease, and heart disease.
How does this translate into human terms? Many scientists aren’t sure. But Dr. Walford, who has conducted much of the research in this area, believes that dietary restriction actually rejuvenates the immune system. He has personally restricted his own calorie intake. (information from “Fighting Disease: The Complete Guide to Natural Immune Power”, by Ellen Michaud, and Alice Feinstein)
Dr. Walford’s belief makes sense. The body has a limited amount of energy to expend. Energy used to digest high calorie, low nutrient foods takes away from energy that could be used to build up and maintain the immune system. There is much scientific evidence that the condition of health and the aging process in humans are very much connected to the strength of the immune system.

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