Which parts of fruits and vegetables contain insoluble fiber?

The peel of fruits and vegetables is where a significant amount of insoluble fiber is found. Insoluble fiber is known for its role in adding bulk to the digestive system, which helps promote regular bowel movements and prevent constipation. The peel often contains tough, fibrous components that are not easily broken down during digestion, making them a key source of this type of fiber.

While the pulp contains some fiber as well, it is primarily composed of soluble fiber, which dissolves in water and serves different dietary functions. Seeds can also contain fiber, but their main contributions often include nutrients and fat rather than being a significant source of insoluble fiber. Juices, on the other hand, generally lack fiber altogether, as the juicing process removes most of the solid materials, including the fiber found in the pulp and peel. Thus, the peel stands out as the best answer representing the part of fruits and vegetables rich in insoluble fiber.