Popcorn

Popcorn ranks first among the most filling low-calorie foods due to its high fiber content. Although 1 cup (8 grams) of air-popped popcorn contains only 31 calories, it contains 1.2 grams of dietary fiber, which accounts for up to 5% of your daily fiber requirements. Fiber not only slows your digestion and makes you feel fuller, but it also helps to keep your blood sugar in check.

Furthermore, compared to many other popular snack foods, popcorn can help lower hunger and increase feelings of fullness. In fact, researchers found that those who ate 100 calories of popcorn were fuller and more satisfied than those who ate 150 calories of potato chips in a 35-people trial. However, keep in mind that these benefits only apply to air-popped popcorn. Many ready-made varieties have a lot of extra fat and, in some instances, sugar, which significantly increases the calorie content.