There's a documentary: The Science of Fasting ( https://www.youtube.com/watch?v=t1b08X-GvRs) which talks about fascinating effects of fasting therapy, and interesting effects of fasting on cancer treatment. Looks like it's inline with what's discussed here and in the comment section. On the flip side, I feel like fasting has the potential of becoming the new "meditation", but with more potential danger than just an over-hyped hip practice.