When we say popcorn, we don’t mean the stuff you get at a concession stand at the state fair or the lobby of a movie theater. We mean natural, air popped popcorn. Air-popped popcorn is naturally high in dietary fiber and antioxidants, low in calories and fat, and free of sugar and sodium. This can make it an attractive snack to people with dietary restrictions on the intake of calories, fat or sodium.
For the sake of flavor, however, large amounts of fat, sugar, and sodium are often added to prepared popcorn, which can quickly convert it to a very poor choice for those on restricted diets. One cup (around 8 grams) popped without any added fats, salt or sugar is approximately 45 kilo-calories.