It's actually quite easy after the first few days. Your body simply has to adjust to burning fat/glycogen. I've gone days when I've eaten maybe 500 calories a

It's actually quite easy after the first few days. Your body simply has to adjust to burning fat/glycogen. I've gone days when I've eaten maybe 500 calories and never felt hungry, but the first day I thought I was going to pass out. One thing you learn from fasting is to recognize when your body actually needs food vs when you just crave a blood-sugar-rush. What most people think of as "hungry" is really just a trained reflex, and it can be retrained. These days if I'm not active I can easily go at least 12 hours without feeling hungry. Granted my job is sitting in a cube 9 hours a day with some scattered meetings. YMMV.