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.

I tried a mix of popular bagged, salted varieties. I also removed the popcorn from the packaging before trying to cut out potential biases related to brand. Here's how the popcorn stacked up ...