Negative calorie foods ??

Hey all, Ive heard and known of the "Negative foods", where you eat these foods and its sooo low in calories that it takes more calories to digest and such that in the end your burning more calories than eaten, makin it a negative calorie food. With that said, I just want your thoughts and comments about this. Thnx a bunch, Robert =)

These are usually foods that are just low in calories... i.e. vegetables... nothing wrong with eating vegetables.