Thin broth also seems to be a good choice. Many people actually can't tell the difference between hunger and thirst, so it's a good idea to drink something and wait 15 minutes to see if the sensation goes away.
And some people are simply sensitive to the movements in their bowels and that can be confused with hunger. Lots of people have IBS or PMS, for instance, that can suddenly increase the urge to eat or even gorge on food.