Biochemistry 4th Edition by Reginald Garrett, Charles Grisham

Exercise 19

Foods rich in filer are basically plant materials high in cellulose, a cell polysaccharide that we cannot digest. The nutritional benefits provided by such foods result from
a. other nutrients present that can be digested and absorbed.
b. macromolecules (like cellulose) that are absorbed without digestion and then catabolized inside the cells.
c. microbes that are the normal symbionts of plant tissues.
d. All of the above.