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Insoluble fiber is found in green beans, dark green leafy vegetables, fruit skins, whole-wheat products, wheat oat, corn bran and nuts. Among the perks of insoluble fiber are regular bowel movements and prevent constipation. It also assists in passing toxic waste through the colon and prevents colon cancer. From digestion to diabetes to cancer, fiber is responsible for improving these conditions. So how much is enough? A person should consume 25 to 35 grams of fiber a day. While many people get their daily intake of fiber from fruits and vegetables, high-fiber cereals such as All Bran (1/3 cup = 8.5 grams), Fiber One (1/2 cup = 14 grams) and 100% Bran (1/2 cup = 8.4 grams) are all optimum sources for fiber.