What Is the Best Source of Insoluble Fiber?


Quick Answer

The best source of insoluble fiber is whole grain in the form of bread, cereal and oatmeal. Vegetables including cauliflower, potatoes and green beans also contain high levels of insoluble fiber.

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Full Answer

Insoluble fibers consist of fibers such as cellulose that plants use for structure. Processed grains do not contain the outer structural shell. Therefore, processed grains do not contain the high amount of insoluble fibers found in whole grains. Skins of fruits, vegetables, beans and seeds all contain insoluble fiber. The human body does not digest insoluble fiber. However, insoluble fiber is vital to the digestive process. It increases the speed of digestion, preventing constipation.

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