Dietary Fiber does not digest or absorb into the body. Instead, it passes through the stomach and intestines relatively intact. Fiber is found in fruits, vegetables, legumes, and whole grains. Berries raisins, pears and apples do not breakdown in the body.
Vegetables such as broccoli and squash contain cell walls that do not digest in the body because the cell walls are made up; of cellulose, which is not digestible by humans. Other non-digestible fibers include hemicelluloses, pectin, gum, and mucilage. Bran is a high fiber grain that isn’t digested in the body. Both insoluble (wheat, bran, veggies and whole grains) and soluble fiber (oats, fruits, veggies, and beans) are not digestible.