Me too, I'll eat a full meal and still be hungry for something else anyway.
I'm also really quite perplexed that I was able to polish off a big box of Chex cereal in less than 20 hours a few days ago....I don't know how I managed to do that on top of several full meals!
I guess I must be lacking in at least one nutrient, it's the only explaination that makes any sense....