What snack food do you know that provides fewer than 100 calories, no fat or sodium, and almost four grams of fiber in three cups? Only one: popcorn. The catch is that it must be air-popped popcorn with no added oil, butter, margarine, or salt. It's chewy, tasty, and filling: everything a snack food should be.
Keep in mind that whole grains, like popcorn, are abundant in vitamins, minerals, fiber, and phytochemicals. In a 12-year study of nearly 75,000 nurses, it was noted that those who ate more whole grains had a lower body weight than those who ate fewer whole grains. And those eating whole grains were less likely to gain weight.
Besides all that, popcorn provides protein. And you can't beat its fiber content, practically all of which is insoluble. Eat plenty of popcorn, and with all the fiber, you'll be less likely to suffer constipation. Plus your intestinal tract will also be less likely to harbor carcinogens and other toxins.