When choosing crisp bread, you should definitely pay attention to the amount of dietary fiber (cellulose) in the composition. It is better to be no less than 10%. Dietary fiber (cellulose) is long digesting carbohydrates, and some of them are not digestive and they move through your intestinal tract unchanged. Such fibers are needed for normal function of the gastrointestinal tract and stool formation. The mechanism is very simple. Fiber swells in the intestine, forming the required volume. BUT! this does not happen, if the person does not consume enough fluids. When having constipation, increasing the level of fiber in your diet usually has a positive effect. However, any crisp bread should be eaten with water, tea and other beverages.