The Unconfirmed Autophagy Peak After 48 to 72 Hours
A review covering 20 human studies finds no established timing for autophagy activation during fasting, leaving Mindy Pelz's claimed peak after 48 to 72 hours unconfirmed.
The claimed autophagy peak after 48 to 72 hours of fasting in humans remains unconfirmed
Mindy Pelz, whose profile appears in the Eternal Search investor section, places the peak of autophagy in this window. Autophagy is the process cells use to break down worn-out components. Pelz herself acknowledges that she could not find research confirming a peak at 48 hours, although many experts discuss it.
On October 13, University of Adelaide researchers Sanjna Singh and Timothy Sargent published a review containing a table of 20 human studies in Biochemical Society Transactions. They suggest that the 24 to 72 hour window originated in mouse experiments. But the two species respond to fasting on different schedules: levels of the hormone FGF21 rise after 6 hours in mice, whereas in humans they rise substantially only by days seven to ten. Timing observed in mice therefore cannot be applied directly to humans.
Measurement adds another difficulty. The protein LC3B-II sits on the membranes of vesicles that package cellular components for breakdown. It accumulates both when clearance speeds up and when its final stage stalls. Its level alone cannot distinguish these processes. To measure the clearance rate, called autophagic flux, researchers compare protein accumulation in two fresh blood samples, blocking lysosomes, the cellular compartments that digest the vesicles' contents, in one sample.
Among six studies of fasting for 24 to 72 hours, only one measured flux. It found no change after a day of fasting. Across the full table, six of 20 studies measured flux, and four found no difference. The sample itself also imposes a limit: in aging male mice, flux increased in blood while decreasing in the heart. A blood result alone therefore cannot describe what happens in other organs.
Pelz's proposed timing remains unsupported: human measurements of flux are scarce, and individual protein measurements allow different explanations. These data cannot establish the hour of a peak or support the conclusion that fasting has no effect on human autophagy.
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Sources
[1] doi.org
[2] youtube.com
[3] nobelprize.org
[4] pubmed.ncbi.nlm.nih.gov
[5] pubmed.ncbi.nlm.nih.gov
[6] pubmed.ncbi.nlm.nih.gov
[7] pmc.ncbi.nlm.nih.gov
[8] pubmed.ncbi.nlm.nih.gov
This item directly tests a specific public claim associated with Mindy Pelz, whose investor profile is listed in Eternal Search, and shows readers how to use the page as an entry point for checking claims against human evidence.