Hey, I heard on this very site that some foods not only don't have any calories (meaning 0; zippo), but some even have -negative calories. Here's the theory: foods of low calories with lots of fiber and water take so much energy to eat, they end up - calories ...
Which ones? Mostly crunchy raw veggies like celery, carrots, broccoli, cauliflower, cukes, and other salad stuff. Not only that, but if you eat them with other foods (even starchy ones), they will wipe out the calories you ate.
PLus, I heard the same thing about FIBER ...