Project 2's Rhesus Monkeys
As noted at wisbusiness, it takes a long time to run a study on calorie restriction (CR) and aging in primates: "A calorie-restriction experiment that began in 1989 with a group of rhesus monkeys under the care of the Wisconsin National Primate Research Center is entering the 'golden years' of the study, and the monkeys are showing no signs of slowing down. ... The monkeys in the oldest group are now about 25, being equivalent to 60-year-old humans ... How well are these calorie-restricted monkeys aging compared to their control group counterparts? They are doing exceedingly well ... showing no obesity, better blood glucose control and, based on studies from the other projects funded by the grant, fewer cellular defects and less muscular atrophy."