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What is insoluble fiber?

Marisa Moore
Nutrition & Dietetics
Insoluble fiber does not dissolve in water.  Insoluble fiber is commonly referred to as "roughage" or nature's broom.  It's known for its ability to move waste through the body and as a result plays a key role in maintaining a healthy digestive tract.

Insoluble fiber is found naturally in whole-wheat bread, wheat bran and a variety of vegetables including cauliflower, green beans and potatoes with the skin.
Emilia Klapp
Nutrition & Dietetics
Insoluble fiber is a subclass of fiber, which itself is a group of carbohydrates. This type of fiber leaves the body in much the same form as it enters because the body does not have the enzymes necessary to digest it. Because this fiber absorbs and holds water, it increases the size and weight of feces, which causes more frequent bowel movements. A diet rich in insoluble fiber is associated with lower blood pressure, decreased constipation, and a decreased risk of colon and rectal cancers.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.