there was a bunch of work by sachin panda and others suggesting that at least in rats or mice and rodent studies it was very beneficial but they have a different biological clock and you know an 18-hour fast and a rodent's like a two to three day fast and a human yeah i think that study failed because i think they only did 16 to 18 hours where you really start getting more d uh deeper fat burning at the 24 hour mark