Originally Posted by WhateverYouLike
Would love to see the well established sources that say not eating increases lifespan.
AFAIK, it was established decades ago that caloric restriction extends lifespan in rodents and yeasts but it's still not proven in primates. Work on drugs that mimic caloric restriction is ongoing.
There are probably better sources, but a quick search turned up this abstract
from Baltimore/Johns Hopkins.
Of course, that's not to say that fasting for x days is of any particular benefit.