Caloric restriction (CR) has been a much discussed topic in scientific circles since the 1930s when researchers found that CR close to, but not including, starvation significantly increased life expectancy in rodents. The studies claimed that it would extend maximum lifespan and delay the onset of age-related diseases.
The study, published in the US National Library of Medicine, relates its findings that there is at least some connection between CR and increased life-expectancy in rhesus monkeys. At the time point recorded (the average age of rhesus monkeys in captivity) 37% of the control animals died of age-related causes while only 13% of the CR animals did.
There was also a stark subjective difference in physical appearance, with the calorie-restricted monkeys appearing much younger. That was one of the reasons for the study in the first place, as the team to set out if they were also biologically “younger”.