Did you guys actually read anything other than leangain's site? Open any web site that makes money on diets and you will see a ton of testimonials and cool pictures. Obviously for 200$ a consultation he will do his best to make as much hype about it as he can.Try doing a Google Scholar search for "intermittent fasting -mice -fish -Ramadan -rats -birds" (that's to exclude animal related articles and Ramadan articles since they were written by Muslim scientists who obviously won't say anything bad about Ramadan).