I’ve done intermittent fasting and found that this is just your body producing hormones telling you its time to eat. These hormones are pretty good at keeping schedules for you. Once you start fasting, you do get jittery and cranky during this time but it goes away rather quickly. After a few days the hormone levels start changing and within a week or two you stop feeling hungry at that time. It’s really weird to teach your body that you don’t need to eat at your usual times. And learning that feeling hungry isn’t the worst thing in the world (if your living conditions are such that you’re not worried about your next meal) is actually very freeing.