Last month I tried to fast. I gave up food. The plan was to refrain from eating more than 500 calories per day for a period of 7 days.
I lasted just over 36 hours, before I had to throw in the towel and eat something a bit more substantial. The thing is, although I failed in this first attempt, I discovered that hunger comes in waves. Recognising the feeling of genuinely being hungry has been a huge help to me. In the past I think I have suffered from habitual hunger, that is, my head telling my stomach that food is due soon and to ignore the hungry feeling.