Intermittent fasting involves cycling between periods of voluntary fasting and non-fasting. This metabolic switch from glucose to fat utilization activates cellular repair processes like autophagy and enhances insulin sensitivity, mimicking some of the key benefits of caloric restriction, a well-established longevity intervention in model organisms.
Verdict
A powerful, no-cost tool for improving metabolic health and cellular repair.
HEALTHSPAN IMPACT
Foundational
RISK LEVEL
Very Low
EVIDENCE GRADE
B
MONTHLY COST
$0 - $0
Protocol
- A common approach is 16:8, fasting for 16 hours and eating within an 8-hour window daily.
- More intensive protocols include alternate-day fasting or one to two 24-hour fasts per week.
- Aligning the eating window with daylight hours (e.g., 8 AM to 4 PM) may offer additional circadian benefits.
Flags
- Not recommended for individuals with a history of eating disorders.
- May be contraindicated for pregnant or breastfeeding women.
- Individuals with diabetes or on medication should consult a physician before starting.
- Can cause initial side effects like headaches, fatigue, or irritability.