Even buttered popcorn can be a healthy snack: Our evaluation of six popular bagged brands shows that most have just 120 to 160 calories in about 3 cups and contain 2 to 4 grams of fiber.

Popcorn is a type of corn kernel that puffs up or "pops" when you heat it. It's low in calories and packs plenty of fiber, which makes it a healthy snack for weight loss. Many forms of popcorn ...