Rich in cellulose, fibers are complex molecules found in a large variety of food of plant origin. Though they are not digested, they help to keep food moving through the large intestine and are useful for the treatment of constipation.
a- Formulate a hypothesis to explain why, in humans, fibers are not digested.
b- Determine, using the paragraph, the important role of fibers.
c- Find, using CDI, examples of food rich in fibers.
