I use to fast in my 20s (back in the 1970s :-) when that fad went by at that time. I would not recommend it for weight loss. I guess if I had 20s and 30s to live over I would spend more time working on my day-to-day healthy eating and habits and less on looking for magic/special diets and trying to fix what wasn't broken. One's body is not an enemy to be subjugated, it's part of one's self.