Pineapple is naturally rich in fiber to help improve your digestion. While high-fiber foods usually contain both soluble and insoluble fiber, most of the fiber in pineapple is soluble. This type of fiber attracts water in your gut, slowing down absorption. During this process, your digestive tract is able to absorb all of the vitamins and minerals from the foods you eat. The small amount of insoluble fiber in pineapple, which comes from the fibrous veins that require extra chewing, pushes out waste. Insoluble fiber keeps you regular and creates soft easy-to-pass stools. For optimal digestive health, you need to consume 14 grams of total fiber for every 1,000 calories you eat, explains the Colorado State University Extension school. A 1-cup serving of pineapple cubes offers approximately 2.2 grams of total dietary fiber.