Jeff Miller/University of Wisconsin-Madison
Canto, left, a 27-year-old rhesus monkey, is on a restricted diet, while Owen, 29, is not. The two monkeys are part of a study of the links between diet and aging.
By NICHOLAS WADE
A long-awaited study of aging in rhesus monkeys suggests, with some reservations, that people could in principle fend off the usual diseases of old age and considerably extend their life span by following a special diet.
Known as caloric restriction, the diet has all the normal healthy ingredients but contains 30 percent fewer calories than usual. Mice kept on such a diet from birth have long been known to live up to 40 percent longer than comparison mice fed normally.
Would the same be true in people? More than 20 years ago, two studies of rhesus monkeys were begun to see if primates responded to caloric restriction the same way that rodents did. Since rhesus monkeys live an average of 27 years and a maximum of 40, these are experiments that require patience.
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