Caloric restriction reduces age-related and all-cause mortality in rhesus monkeys.
Level 5 - mechanism / opinion, no new human data
Animal intervention study (rhesus monkeys) without human clinical data.
PubMed 24691430 · doi:10.1038/ncomms4557
What was done
Longitudinal evaluation of the effects of long-term ~30% caloric restriction (without malnutrition) initiated in young adulthood on age-related and all-cause mortality in rhesus monkeys. The authors also compared control animal body weights between this cohort, a previous National Institute on Aging (NIA) primate cohort, and a multi-centered relational database of primate aging.
What was found
Caloric restriction was reported to significantly improve both age-related and all-cause survival in rhesus monkeys compared with controls. No specific numerical values, sample sizes, hazard ratios, median survival lengths, or p-values were reported in the abstract. Body weight comparisons suggested that control animals in the conflicting 2012 NIA study were effectively undergoing caloric restriction.
Why it matters
This study provides evidence that the lifespan-extending effects of caloric restriction observed in short-lived model organisms are conserved in primates, informing the translatability of caloric restriction to human aging.
Limits
The study was conducted in captive non-human primates, limiting direct clinical translation. The abstract omits sample sizes, exact mortality rates, effect sizes, and statistical confidence intervals. Cross-study dietary implementation differences (such as control feeding regimens) introduce substantial confounding across primate longevity trials.
Cited by
- context Early research by Roy Walford and Rick Weindruch at the University of Wisconsin demonstrated that calorie restriction extends lifespan.