
The Human Upgrade: Biohacking for Longevity & Performance What If You Stop Eating For 72 Hours? : 1375
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Dec 7, 2025 What if skipping food for 72 hours could actually reverse aging? Discover how the body traverses critical phases during fasting, triggering cellular repair through autophagy. Learn why short fasts fall short and what common mistakes can sabotage your progress. Dave shares insights on strengthening mitochondria, sharpening the mind, and refeeding safely after fasting. Plus, dive into the importance of listening to your body during this transformative journey.
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Aging Starts Inside Cells
- Aging is driven by cellular damage and dysfunctional mitochondria, not just birthdays or wrinkles.
- Modern lifestyle factors like constant eating, stress, and poor sleep prevent cellular repair and accelerate decline.
Fasting Moves Through Fuel Phases
- Metabolic fuel phases shift from fed state to glycogen use then to fat-derived ketones as fasting continues.
- Ending a fast at 16 hours often stops the process just as deeper fat burning and ketone benefits begin.
Use Ketones To Smooth The First Day
- To ease day-one hunger, use fats or exogenous ketones like butter, MCT, or a ketone drink during the fast.
- Ketones stabilize energy and sharpen the mind while you transition into ketosis.



