Death wasn't the only change. The calorie-cut monkeys had less than half the incidence of cancerous tumors or heart disease as the monkeys who ate normally. Brain scans showed less age-related shrinkage in the dieting monkeys. They also retained more muscle, something else that tends to waste with age. Compare two cage-by-cage photos of the monkeys and the difference is obvious: A 29-year-old monkey happens to be the oldest non-dieting monkey still alive, and a 27-year-old the oldest still-living ...