Male grey mouse lemurs that eat 30% fewer calories starting in early adulthood live 50% longer on average and die less frequently from age-related causes compared to those eating normally.
See the scientific wording
In male grey mouse lemurs, chronic caloric restriction of 30% initiated in early adulthood is associated with a 50% increase in median lifespan (from 6.4 to 9.6 years) and a 60% reduction in age-related mortality.
Correlational — new studies may shift this
Randomized trialsOne low-scoring study links this claim to the outcome, but causation is not established.
What the research says
1 study reviewedSupporting (1)
Caloric restriction increases lifespan but affects brain integrity in grey mouse lemur primates
Cohort StudyAnimal2018
Male mouse lemurs that ate 30% less food lived about half as long again and got sick less often, which means eating less helped them live healthier longer lives — even though their brains changed in some ways, it didn’t make them dumber.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
Eating 30% less food lowers the body's energy use and reduces harmful byproducts from metabolism, which decreases damage to cells and tissues. This slows the breakdown of protective insulation around nerve fibers and reduces disease-causing inflammation, allowing the body to stay healthier longer and live more years.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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Male grey mouse lemurs that eat 30% fewer calories starting in early adulthood live 50% longer on average and die less frequently from age-related causes compared to those eating normally.
Mechanism
1 studyEating less food slows down harmful processes in the body that cause aging, like cell damage and inflammation. This keeps vital tissues healthier for longer, allowing the animal to live more years without serious illness. Some parts of the brain shrink faster, but this does not affect thinking or behavior.
Eating 30% less food lowers the body's energy use and reduces harmful byproducts from metabolism, which decreases damage to cells and tissues. This slows the breakdown of protective insulation around nerve fibers and reduces disease-causing inflammation, allowing the body to stay healthier longer and live more years.
Chronic caloric restriction lowers systemic metabolic rate and reduces the production of reactive oxygen species
Reduced oxidative stress decreases chronic inflammation and limits activation of microglia and damage to oligodendrocytes
Preserved oligodendrocyte function and myelin integrity slow the atrophy of white matter in critical neural tracts
Lowered systemic inflammation and reduced cellular damage delay the onset and progression of age-related diseases
Delayed disease progression extends median lifespan and reduces age-related mortality
Less supported by current evidence, but not ruled out
Reduced food intake lowers signals that maintain brain cell structure and connections, causing some brain regions to shrink faster even as the rest of the body stays healthier.
Caloric restriction alters insulin/IGF-1 and neurotrophic signaling pathways in the brain
Neurons in the hippocampus and entorhinal cortex undergo atrophy, dendritic retraction, or reduced synaptic turnover
Accelerated loss of grey matter volume occurs in specific brain regions despite extended lifespan
Evidence from Studies
Supporting (1)
Community contributions welcome
Male mouse lemurs that ate 30% less food lived about half as long again and got sick less often, which means eating less helped them live healthier longer lives — even though their brains changed in some ways, it didn’t make them dumber.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Systematic Review of Caloric Restriction Effects on Lifespan in Non-Human Primates
Systematic review and meta-analysis of all published longitudinal studies on chronic 30% caloric restriction initiated in early adulthood in male grey mouse lemurs, comparing median lifespan and age-related mortality rates between restricted and ad libitum-fed groups.
Randomized Controlled Trial of 30% Caloric Restriction vs Ad Libitum Feeding on Lifespan in Male Grey Mouse Lemurs
Randomized assignment of male grey mouse lemurs in early adulthood to either 30% chronic caloric restriction or ad libitum feeding, with blinded outcome assessment of median lifespan and age-related mortality over the full lifespan.
Prospective Cohort Study of Caloric Restriction and Lifespan in Male Grey Mouse Lemurs
Prospective observation of two cohorts of male grey mouse lemurs: one receiving 30% caloric restriction from early adulthood, the other fed ad libitum, with longitudinal tracking of survival and cause-specific mortality until death.
Longitudinal Study of 30% Caloric Restriction on Lifespan and Mortality in Male Grey Mouse Lemurs
Observational study of male grey mouse lemurs maintained under controlled conditions with either 30% caloric restriction or normal feeding from early adulthood, recording survival times and causes of death.
Case Report of Extended Lifespan in a Male Grey Mouse Lemur Under 30% Caloric Restriction
Detailed documentation of individual male grey mouse lemurs subjected to 30% caloric restriction from early adulthood, including lifespan, health markers, and cause of death.