The 'theory' of fasting is that by not eating a minimum of 12 hours - it supposedly gives your body / organs / cells time to repair / renew / regenerate/ rejuvenate.
A good example is all those binge drinkers who go crazy Friday , Sat and even Sunday evenings then drink nothing for 4 or 5 days and the liver just repairs itself in time for the weekend..
If they just kept drinking day after day they'd be dead or at best very poorly ...
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My understanding was that the liver is the only organ in the body that rejuvenated itself.
I'm finding this interesting, but being that I've worked with food my whole adult life I'm not capable of fasting. I eat when I'm hungry,, hahahaha.