In a controversial study published July 10, 2009 in Science (Science 325:201), researchers report that feeding rhesus monkeys (Macaca mulatta) a diet that is 30% less calories than that of the control group results in lifespan extension. Rhesus monkeys live, on average, 27 years in captivity. Currently, in this 20 year long study, half of the control animals are still living compared with 80% of the animals on the restricted diet. Additionally, animals on the lower calorie diet exhibit less age-related diseases such as diabetes, cancer, cardiovascular disease, and brain atrophy.
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