Insoluble fiber is a type of fiber that, when consumed, passes through the body and is excreted, rather than being absorbed into the bloodstream. This type of fiber is “insoluble”, meaning that it does not readily mix with water. In this case, it will pass through the intestine intact.
There are many foods that serve as a source of insoluble fiber, including fruits, vegetables, nuts and seeds.
Insoluble fiber is mostly used in the maintenance of intestinal health by mainly reducing constipation. It does not play a significant role in cholesterol reduction.