Glad to see more skeptics on here. I do 3-day water-only fasts (not intermittent, just 72 hours straight) once a month. I get very little noticeable benefit if any. For me, the benefits are all "soft" benefits - willpower practice, realizing how little I actually need to eat, and very, very minimal fat loss if I walk for 8 hours on the last day.
Do wish all the magic, memory, autophagy, cancer-prevention, more HGH things were true though, but it does seem like they are blown out of proportion if there at all.