10 High-Fiber Snacks That'll Keep You Feeling Full For Longer

You may not know it, but popped popcorn is actually full of fiber, Agyeman says. "In fact, the fiber in popcorn is insoluble fiber, which is the bulking fiber that helps keep your bowels moving regularly," she says. Just three cups of popcorn contain four grams of fiber.

To give your popcorn some flavor, consider a sprinkle of nutritional yeast on top. Nutritional yeast not only delivers a nutty taste but also boosts the fiber content of your snack, according to Wilson. "Two tablespoons of nutritional yeast can provide around four to five grams of fiber, which is about 20 percent of your recommended daily intake," she adds.