Alternate-Day Fasting (ADF) involves cycles of fasting and non-fasting periods, promoting metabolic flexibility by shifting the body's primary fuel source from glucose to ketones. This pattern can induce cellular repair processes like autophagy, improve insulin sensitivity, and support healthy weight management. These metabolic adaptations are relevant to healthspan by reducing chronic disease risk and potentially slowing age-related decline.
Verdict
Effective for metabolic health, requires careful implementation.
HEALTHSPAN IMPACT
High Value
RISK LEVEL
Low
EVIDENCE GRADE
A
MONTHLY COST
$0 - $0
Protocol
- Consume zero or very low calories (typically <500 kcal) on fasting days, alternating with ad libitum eating on non-fasting days.
Flags
- Not suitable for individuals with a history of disordered eating or certain medical conditions.
- May cause initial fatigue, headaches, or irritability as the body adapts.
- Risk of nutrient deficiencies if food choices on eating days are not balanced.
- Requires careful monitoring for individuals on medications, especially for diabetes or blood pressure.
- Long-term effects on bone density and muscle mass require further investigation.