What are the differences between dietary fiber and crude fiber (roughage)?
Dietary fiber can be divided into two major types: insoluble and soluble fibers. Insoluble fiber is also called crude fiber and derived from the outer protective layer of seeds, and the skins of fruits and vegetables, including cellulose, hemicelluloses and lignin, etc., which make up the structural parts of plant cell walls. Soluble fiber includes pectins, gums and mucilage, which are found mainly in fruits and grains and dissolve in the intestines to form a viscous gel.
