Caloric restriction and longevity.

I thought I would pass on this recent open access Nature article by the Univ. of Wisconsin group studying the effects of caloric restriction in Rhesus monkeys, studies meant to be more relevant to us humans that the mouse work showing increased health and longevity caused by dietary restriction. They suggest that a reason that an NIH study found less striking effects was that the controls in the NIH study were also effectively calorically restricted.

Caloric restriction (CR) without malnutrition increases longevity and delays the onset of age-associated disorders in short-lived species, from unicellular organisms to laboratory mice and rats. The value of CR as a tool to understand human ageing relies on translatability of CR’s effects in primates. Here we show that CR significantly improves age-related and all-cause survival in monkeys on a long-term ~30% restricted diet since young adulthood. These data contrast with observations in the 2012 NIA intramural study report, where a difference in survival was not detected between control-fed and CR monkeys. A comparison of body weight of control animals from both studies with each other, and against data collected in a multi-centred relational database of primate ageing, suggests that the NIA control monkeys were effectively undergoing CR. Our data indicate that the benefits of CR on ageing are conserved in primates.