Reviewed by Integrative Medicine & Clinical Nutrition Faculty Board
Clinical Overview
The biochemistry of cellular renewal: suppressing mTOR, activating AMPK, clearing senescent cells, and preserving muscle protein synthesis during fasting windows.
Time-restricted feeding and periodic prolonged fasting activate cellular autophagy—a lysosomal degradation pathway that recycles damaged organelles and misfolded proteins.
1. Cellular Signaling: AMPK vs. mTOR
Fasting Duration
Primary Metabolic Shift
Cellular Longevity Pathway
12 to 14 Hours
Liver glycogen depletion; ketogenesis initiates
AMPK activation; basal fat oxidation
16 to 18 Hours
Significant ketone elevation (β-hydroxybutyrate)
Autophagy activation; reduced systemic mTOR
24 to 36 Hours
Profound cellular cleanup & glycogen exhaustion
Senescent cell clearance; peak autophagy
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Integrative Medicine & Clinical Nutrition Faculty Board
Our clinical faculty specializes in functional endocrinology, GI-MAP microbiome restoration, advanced lipidology (ApoB/Lp(a)), and cellular longevity medicine.
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