You can do even better than a bowl of cereal. Eat something fatty, and even eating a little will significantly reduce your hunger. These days fatty food, such as cheese and creamy yogurt have been a staple of my diet: I can go by for a lot longer without eating much that way. The fruit-fat-nuts diet is _completely_ doable (of course, I eat 'normal' food too, for a more balanced diet, but only in the weekends, etc.)