Studies since the 1950s show the caloric restriction on laboratory animals. By restricting calories and maintaining a high level of nutrition, which are called CRONs (Caloric Restriction with Optimal Nutrition) animals tend to live longer. Studies show they can live between 30 to 200 percent longer, depending on the species. These studies have been done on several dozen species and the results are the same throughout. The same studies are currently being done on primates but it could take up to 10+ years to know see the results.