fiber in popcorn
Insoluble Fiber. Popcorn is especially rich in insoluble fiber, containing 1.9 grams of insoluble fiber in every 3-cup serving. This is as much insoluble fiber as you would get from eating one small, unpeeled apple or a 3/4-cup serving of cooked oat bran. Insoluble fiber does not absorb water in the digestive tract.