# 16:8 Fasting - Clinical Longevity Review & Consensus Audit

> **Consensus Verdict**: Sharpen your focus and stabilize energy levels throughout the day by compressing your eating window, a practice that activates your body's cellular cleanup processes for long-term health.

## 1. Executive Summary & Scores
- **Longevity Evidence Score**: **84/100**
- **Evidence Quality Tier**: **bronze**
- **Human Clinical Evidence Strength**: 70/100
- **Primary Longevity Classification**: other
- **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
Suppresses mTOR metabolic signaling while elevating AMPK, promoting glycogen depletion, cellular autophagy, and ketone body production (beta-hydroxybutyrate).

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## 3. Canonical Longevity Vector Impacts (The 8 Longevity Pillars)

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## 4. Practical Protocol & Administration Guidelines
- **Standard Clinical Dosage**: 16 hours fasted
- **Recommended Timing**: Start fasting window after dinner (e.g. 8 PM - 12 PM next day)
- **Administration Type**: fasting
- **Recommended Biomarkers to Monitor**: mental_clarity, focus, satiety, digestive_comfort, energy, brain_fog

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## 5. Safety, Contraindications & Drug Interactions
- **Contraindications**: History of eating disorders, Pregnancy, Type 1 Diabetes (without supervision)
- **Safety Profile**: low_risk - Well tolerated within physiological ranges.

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## 6. Peer-Reviewed Human Clinical Trials & Key PMIDs
1. **Early Time-Restricted Feeding Improves Insulin Sensitivity, Blood Pressure, and Oxidative Stress Even without Weight Loss in Prediabetic Men** [PMID: 29754952]
   - Link: https://pubmed.ncbi.nlm.nih.gov/29754952
2. **Time-Restricted Eating and Healthy Aging in Humans** [PMID: 36561139]
   - Link: https://pubmed.ncbi.nlm.nih.gov/36561139
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**: [16:8 Fasting on LongevityReviews](https://longevityreviews.org/modalities/intermittent-fasting-16-8)
- **Last Evidence Calibration**: 2026-08-04
- **Review Policy**: 0% sponsored placements, independent peer-reviewed consensus.