Summary
A detailed hour-by-hour breakdown of what happens in your body during an extended 100-hour fast. Dr. Jockers explains the metabolic shifts, autophagy activation, and physiological changes that occur.
Key Points
- Hour-by-hour metabolic changes
- When autophagy kicks in
- Ketone production timeline
- Growth hormone and fasting
- Breaking a long fast safely
- Who should avoid extended fasts
Key Moments
Autophagy ramps up significantly by 24-48 hours of fasting
Dr. Jockers explains that autophagy -- the body's cellular cleanup process -- ramps up significantly between 24 and 48 hours of fasting, clearing damaged cells and proteins that accumulate during normal metabolism.
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Immune system reset occurs at 48-72 hours as old white blood cells recycle
At the 48-72 hour mark, the immune system begins a reset as old, damaged white blood cells are recycled and replaced, a process that may benefit people with chronic inflammation and autoimmune conditions.
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Ketone production timeline and growth hormone elevation during fasting
Jockers maps the ketone production timeline throughout a 100-hour fast, showing how the body progressively shifts to fat burning while growth hormone elevates substantially to preserve muscle mass.
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