Insoluble fiber is a type of dietary fiber that does not dissolve in water. It adds bulk to the stool and helps food move through the digestive system, promoting regular bowel movements. Common sources of insoluble fiber include whole grains, nuts, seeds, and the skins of many fruits and vegetables. Unlike soluble fiber, which can dissolve in water and form a gel-like substance, insoluble fiber remains intact. This characteristic makes it beneficial for preventing constipation and maintaining overall gut health. Including adequate amounts of insoluble fiber in your diet can support digestive health and reduce the risk of certain gastrointestinal disorders.