Monkeys that eat fewer calories for a long time tend to move around more and stay active longer than monkeys that eat normally, even though they're taking in less energy.
See the scientific wording
Long-term calorie restriction in rhesus monkeys is associated with a 2-fold increase in the duration of physical activity above 1.6 metabolic equivalents (METs) compared to control animals.
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)
Cohort StudyAnimal2013
Monkeys that ate less over many years stayed more active than monkeys that ate normally—even though they were older. They moved more at higher intensities, like walking or climbing, without getting tired faster.
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.
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Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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Monkeys that eat fewer calories for a long time tend to move around more and stay active longer than monkeys that eat normally, even though they're taking in less energy.
Evidence from Studies
Supporting (1)
Community contributions welcome
Monkeys that ate less over many years stayed more active than monkeys that ate normally—even though they were older. They moved more at higher intensities, like walking or climbing, without getting tired faster.
1 study stuck in processing — a maintainer can requeue it.
Contradicting (0)
Community contributions welcome
1 study has been processing far longer than a normal run. The pipeline may be stuck — a maintainer can requeue it, and the results will appear here once it finishes.
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 Long-Term Calorie Restriction Effects on Physical Activity in Non-Human Primates
Systematic review and meta-analysis of all published longitudinal studies comparing physical activity duration above 1.6 METs in calorie-restricted versus control rhesus monkeys, with standardized outcome measures and adjustment for age, sex, and baseline activity.
Randomized Controlled Trial of Calorie Restriction vs Ad Libitum Feeding on Physical Activity in Adult Rhesus Monkeys
Randomized assignment of adult rhesus monkeys to either a calorie-restricted diet (30% reduction) or ad libitum feeding, with physical activity measured continuously via accelerometry over 5 years, controlling for environmental and social factors.
Prospective Cohort Study of Calorie Intake and Physical Activity Trajectories in Rhesus Monkeys Over 10 Years
Prospective observation of a cohort of rhesus monkeys with annual measurements of calorie intake and physical activity (via accelerometry) over a 10-year period, adjusting for age, sex, and health status.
Case-Control Study Comparing Physical Activity Levels in Rhesus Monkeys with High vs Low Long-Term Calorie Intake
Retrospective comparison of 50 monkeys with sustained high activity (>2x baseline MET duration) to 50 matched controls with low activity, reconstructing their historical calorie intake records over 5+ years.
Pilot Study Measuring Physical Activity Changes in Rhesus Monkeys Following 12-Month Calorie Restriction
Small group (n=10) of rhesus monkeys subjected to 12 months of 30% calorie restriction with daily accelerometry-based activity monitoring, compared to a matched control group (n=10).