# OMAD (One Meal A Day) - Clinical Longevity Review & Consensus Audit

> **Consensus Verdict**: Fast for ~23 hours each day and consume all daily calories in a single 1-hour feast meal.

## 1. Executive Summary & Scores
- **Longevity Evidence Score**: **84/100**
- **Evidence Quality Tier**: **bronze**
- **Human Clinical Evidence Strength**: 70/100
- **Primary Longevity Classification**: nutrition
- **Safety Margin Score**: 92/100 (Higher is safer)
- **Time Burden**: ~15 minutes/day
- **Estimated Monthly Cost**: free
- **Adherence Friction**: 3/10 (Lower is easier to sustain)

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## 2. Biological Mechanisms of Action
Single daily meal gives 23 continuous hours of low-insulin quiescence, clearing intracellular metabolic debris and upregulating SIRT3 mitochondrial deacetylation.

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## 3. Canonical Longevity Vector Impacts (The 8 Longevity Pillars)
- **Metabolic Flexibility & Glycemic Control**: **78/100** [Rank #38 of 129 in Metabolic] - Effect: Improves peripheral insulin sensitivity and AMPK signaling
    - Mechanism: Activates hepatic and muscular AMPK phosphorylation to facilitate glucose uptake.
- **Cancer Defense & DNA Repair**: **80/100** [Rank #9 of 120 in Cancer Defense] - Effect: Stimulates macroautophagic clearance and Nrf2 xenobiotic detox
    - Mechanism: Downregulates mTORC1 to trigger intracellular autophagosomal engulfment of damaged organelles.

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## 4. Practical Protocol & Administration Guidelines
- **Standard Clinical Dosage**: 23 hours fasting / 1 hour meal window
- **Recommended Timing**: Single daily meal (e.g. 4 PM - 6 PM)
- **Administration Type**: fasting
- **Recommended Biomarkers to Monitor**: digestive_comfort, mental_clarity, satiety, energy, focus, cancer_defense

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## 5. Safety, Contraindications & Drug Interactions
- **Contraindications**: None reported in standard human trials with recommended doses.
- **Safety Profile**: low_risk - Well tolerated within physiological ranges.

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## 6. Peer-Reviewed Human Clinical Trials & Key PMIDs
1. **Cellular Senescence and Senolytics in Aging** [PMID: 30172924]
   - Link: https://pubmed.ncbi.nlm.nih.gov/30172924/
2. **Targeting AMPK in Metabolic Disease and Aging** [PMID: 32060683]
   - Link: https://pubmed.ncbi.nlm.nih.gov/32060683/
3. **Effects of Intermittent Fasting on Health, Aging, and Disease** [PMID: 31881139]
   - Link: https://pubmed.ncbi.nlm.nih.gov/31881139/

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## 7. Canonical Citation & Web Verification
- **Official Web Review**: [OMAD (One Meal A Day) on LongevityReviews](https://longevityreviews.org/modalities/omad-fasting)
- **Last Evidence Calibration**: 2026-08-04
- **Review Policy**: 0% sponsored placements, independent peer-reviewed consensus.