Food high in fiber - Fiber Perfect increases stool bulk, the growth of beneficial intestinal microflora and promotes normal bowel function. Fiber promotes normal bowel function and help friendly bacterial growth. Dietary Fiber is found mainly in fruits, vegetables, whole grains and legumes. Dietary Fiber is probably best known for its ability to prevent or relieve constipation. Fresh food is the best source of Dietary Fiber because it contains other important vitamins. Dietary Fiber proper amount improves health in ways other than digestion.