Prolonged fasting involves abstinence from caloric intake for typically 3-5 days, triggering systemic metabolic shifts. Key mechanisms include enhanced autophagy, which clears damaged cellular components, improved insulin sensitivity, and activation of stress response pathways that confer cellular resilience. These changes are believed to contribute to cellular rejuvenation and potentially slow aspects of biological aging.
Verdict
Supervised prolonged fasting significantly optimizes cellular health and metabolic resilience.
HEALTHSPAN IMPACT
High Value
RISK LEVEL
Moderate
EVIDENCE GRADE
B
MONTHLY COST
$0 - $2000
Protocol
- Typically involves 3-5 days (72-120 hours) of water-only intake, sometimes with non-caloric fluids, under medical guidance.
- Often preceded and followed by a refeeding period with specific dietary considerations to mitigate refeeding syndrome risks.
- Frequency may range from once every few months to annually, depending on individual health status and goals.
Flags
- Not suitable for individuals with certain medical conditions, including advanced diabetes or eating disorders.
- Risk of electrolyte imbalances, dizziness, fatigue, and headache, particularly without proper supervision.
- Refeeding syndrome is a serious risk if not managed carefully post-fast.
- May interact with certain medications, requiring dosage adjustments or cessation.