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Medical Definition of Sharpey's fiber. : any of the thready processes of the periosteum that penetrate the tissue of the superficial lamellae of bones.
Dietary fiber is a plant-based nutrient that is sometimes called roughage or bulk. It is a type of carbohydrate but, unlike other carbs, it cannot be broken down into digestible sugar molecules. Therefore, fiber passes through the intestinal tract relatively intact. However, on its journey, fiber does a lot of work.