Fiber is classifies as either soluble or insoluble. Soluble fiber forms gels in water. It help prevent heart disease and stoke by binding bile and cholesterol; diabetes by slowing glucose absorption; and constipation by holding moisture in stools and softening them. Soluble fibers include gums found in foods such as oats, legumes, guar, and barley, as well as pectin found in foods like apples, citrus fruits, strawberries, and carrots. Insoluble fiber comprises the structural part of the plant. It reduces constipation and lowers the risk of hemorroids and diverticulosis by adding bulk to the feces and reducing transit time in the colon. Other insoluble fibers include cellulose found in whole-wheat flour, bran, and vegetables; hemicellulose found in whole grains and bran; and lignin found in mature vegetables, wheat, and fruit with edible seeds (like strawberries). Increases consumption of insoluble fiber helps to increase satiety, and the feeling of fullness may lead to decreased caloric intake. As a result, a diet high in insoluable fiber may promote weight loss.

There you go, nitty gritty and all:) Now go eat an apple!