Dietary fiber is a collective term

Dietary fiber is a collective term for a variety of plant substances
that are resistance to digestion process of human gastrointestinal
enzymes. Several studies revealed that fiber-rich
foods have important effect of serum cholesterol [5,18]. Hence,
enrichment of cereal bakery products with HSR would
enhance the nutritional quality of the product and diversify
the sources of fiber other than cereal bran sources.