Actually, the IF is something that our friend Grok would have done if he had been in situations where his food would take a bit longer to get to. The real purpose behind the IF is that it teaches the body to reach for the stored body fat as a way to find energy, rather than full out dependency on carbohydrates for survival. It is also good to help you release and shed excess water and a burn a fair amount of fat in a short period of time. It does not hurt the body if done once in a while and for no more than 24 hours at a time. Many Orthodox religions suggest fasts like this as part of their rituals.