I am sure fasting proponents promise way too many things, but the underlying cell cleanup mechanism [0] is very real and received the Nobel Prize in 2016 [1]
fasting and CR [calorie restriction] are the most potent non-genetic autophagy stimulators, and lack the undesirable side effects associated with alternative interventions.
We conclude that both fasting and CR have a role in the upregulation of autophagy, the evidence overwhelmingly suggesting that autophagy is induced in a wide variety of tissues and organs in response to food deprivation
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I am sure fasting proponents promise way too many things, but the underlying cell cleanup mechanism [0] is very real and received the Nobel Prize in 2016 [1]
[0] https://en.wikipedia.org/wiki/Autophagy
[1] https://pubmed.ncbi.nlm.nih.gov/27912049/
The wiki page does not mention fasting.
From: https://pubmed.ncbi.nlm.nih.gov/30172870/