Fasting depletes glutathione, which looks like it might matter for COVID-19. Do your reading.
(Also relevant for acetaminophen.)
Thanks for the tip. I supplemented with many things after ending the fast, to be safe, including glycine which looks like a component of glutathione. I have not been sick or ill since mid-2019. I am still fasting often and believe it to help my immune system.
Yes, in general I think fasting is great for health.