The Anti-Longevity PlaybookGet the Playbook
Evidence Review
Intermittent Fasting
Verdict
UnprovenEvidence Tier
C
Weak evidence
Human Studies
Yes — mixed results
Typical Cost
$0/mo
Intermittent fasting reliably produces weight loss — roughly equivalent to standard caloric restriction. However, no human study has demonstrated longevity benefits independent of weight loss. Time-restricted eating shows modest metabolic improvements in some studies but not others. The "autophagy" claims popular in longevity circles are extrapolated from animal data and short-term human biomarker studies.
The full evidence review — including why the autophagy claims are extrapolated from animal data and what human trials actually show — is in Section 3 (Fasting & Dietary Protocols) of The Anti-Longevity Playbook.
Reviewed by Dr. Ramy Khalil, MD · Double Board-Certified Internal Medicine · Last updated March 2026
Does intermittent fasting extend lifespan?
IF produces weight loss similar to caloric restriction, but no human study shows longevity benefits beyond weight loss. Autophagy claims are largely extrapolated from animal data.
Free Chapter
Want the full picture?
Start with a free chapter.
Read the first chapter of The Anti-Longevity Playbook free — including the intervention with stronger mortality data than Intermittent Fasting.
More from Fasting & Dietary Protocols
Browse All Evidence Reviews
30+ longevity interventions reviewed by a physician against the primary literature.
ExerciseStatinsApoB TestingNMNNMN vs. NR — Which Is Better?ResveratrolRapamycinMetformin for LongevityBPC-157PeptidesCold Plunge / Cold ExposureSaunaSleepTestosterone Replacement TherapyGrowth HormoneContinuous Glucose MonitorFull-Body MRI ScreeningBiological Age TestsSemaglutideTirzepatideIntermittent FastingCaloric RestrictionBerberineOmega-3 Fatty AcidsVitamin DMagnesiumCoQ10SpermidineCreatineSocial ConnectionAlcohol