Rhesus monkeys Canto

This May 28, 2009, photo provided by the University of Wisconsin at Madison via the journal Science shows Rhesus monkeys Canto, 27, left, who is on a restricted diet, and Owen, 29, right, who is on an unrestricted diet, at the Wisconsin National Primate Research Center at the University of Wisconsin-Madison. The two are among the oldest surviving subjects in a pioneering study of the links between diet and aging in Rhesus macaque monkeys. The 20-year study found cutting calories by almost a third slowed the aging of monkeys, and fended off death, and shows the first evidence that it delays the diseases of aging in primates too, researchers from the University of Wisconsin report in the Friday, July 10, 2009, issue of the journal Science. (AP Photo/UW-Madison University, Jeff Miller)
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