For me, it was not as difficult as it sounds. I am currently on a fast. I ate this past Monday night and plan to break it tomorrow morning. Again, for me, around 24-36 hours there is some hunger but easily solved with a glass of water. From 24-36 hours on I do not experience any hunger at all. Like most anything, it is probably easier and maybe even better to ease into the fast. Do 24-36 hours, then wait a while and maybe try 48 hours. Then later add 12 more, then 12 more and so on. I don't know if I'm different, or maybe just weird, but I have tons of energy after the first 24 hours or so. The energy and ability to go and go lasts for a day or so after I break the fast. I'm a fan of carnivore, fasting and resistance training. The combination is working really well for me. Scott