Calorie restriction and aging: review of the literature and implications for studies in humans.
Level 5 - mechanism / opinion, no new human data
Narrative review of animal studies and theoretical commentary on human application
PubMed 12936916 · doi:10.1093/ajcn/78.3.361
What was done
This narrative review examined literature on calorie restriction (CR), longevity, and age-related chronic diseases across model organisms (yeast, worms, flies, fish, mice, and rats) and evaluated the feasibility, ethical concerns, and design requirements for future studies in nonobese humans.
What was found
The abstract reports no numerical data. It notes that CR consistently extends lifespan and delays chronic disease in animal models, accompanied by decreased metabolic rate, reduced oxidative stress, improved insulin sensitivity, and neuroendocrine changes. Direct evidence for extended lifespan or improved aging biomarkers in humans is absent, with historical human starvation data confounded by poor nutritional quality.
Why it matters
It clarifies the gap between robust animal longevity mechanisms and human translation, highlighting specific physiological endpoints required for human CR trials.
Limits
The paper presents no new human empirical data and is a narrative rather than systematic review. Translating animal CR paradigms to humans is limited by ethical challenges, adherence barriers in obesogenic environments, and lack of long-term trial data in nonobese populations.
Cited by
- supports Studies across multiple species, including mice, demonstrate that severe caloric restriction significantly extends lifespan.