SOURCE-BASED EDITORIAL GUIDE · SPECIALIST REVIEW PENDING

What the evidence says

Calorie restriction and fasting describe different interventions. NIA highlights that animal findings and short human studies do not settle questions of long-term safety or lifespan.

CALERIE research examined biological aging measures over two years. A change in a biomarker is not a direct observation of longer life.

THE TAKEAWAY

Keep the intervention and the measured endpoint separate.

Where the evidence stops

No fasting schedule or calorie target is recommended here. Suitability depends on individual health circumstances.

Read the original sources

Source pages checked on 23 October 2026. This is not the publication date of each study. Original sources may be in English.

NIA · Calorie restriction and fastingwww.nia.nih.gov · Sources checked: 2026-10-23NIA · CALERIE and biological agingwww.nia.nih.gov · Sources checked: 2026-10-23

Questions worth taking further

  • Was the outcome measured in humans, animals or cells?
  • Does the study population match the people in the claim?
  • What benefits, harms and uncertainties remain unmeasured?