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A rhesus monkey eats its food at UW-Madison's National Primate Research Center. Some monkeys have been eating 30 percent fewer calories than normal for years. They are a three times less likely to develop or die from age-related diseases at any given time, a new study says.

Each morning, rhesus monkeys in a study on aging at UW-Madison's Wisconsin National Primate Research Center get a ration of food pellets. Half of the monkeys get smaller portions; they are less likely to get or die from age-related diseases, the study found.

Ricki Colman, right, a researcher at the primate research center, talks to another researcher at the center. Colman helped lead a study showing that rhesus monkeys that eat less food are less likely to get or die from age-related diseases.

Rhesus monkeys in a study on aging at get snacks of fruit or vegetables, in addition to their ration of food pellets. Even the monkeys on a low-cal diet get the snacks, researchers said.

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