I remember when I first started to lose weight, one trick my nutritionist told me to try was to drink a glass of water when I felt like I was hungry. It sounds really simple, but it's a great trick, because it fills you up enough to make you wait for a little period of time to see if you are actually hungry or if it is just "hunger out of habit". If it is a temporary food craving, then it may pass. I used the same trick when I quit smoking. When I wanted a cigarette, I would drink a glass of water really slowly and often the craving passed.