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I was doing a 24hr fast once a month, but fell off the wagon. I'm fasting today, and will try to stay on it.
A researcher I know has been putting out some very interesting papers suggesting that plasma dilution in older individuals can have robust rejuvenating effects.
https://pubmed.ncbi.nlm.nih.gov/32474458/
Her group recently demonstrated that old blood was deleterious for young animals.
https://pubmed.ncbi.nlm.nih.gov/27874859/
It's interesting to think that something as simple as a build up of factors in blood could be such a large part of the aging program. It seems in easy agreement with the "healthy blood donor effect" and the widespread historical use of blood-letting, but we shall see... I am watching this closely.