Fiber is not really a nutrient, because it passes through our body undigested. Why can't fiber be digested and why is it important to our diet? a b C Fiber is important for keeping the digestive tract working smoothly Since we do not digest it the fiber in food passes into the intestine and absorbs water The undigested fiber creates bulk so the muscles in the intestine can push waste out of the body Eating enough fiber helps prevent constipation. The enzymes required to digest cellulose are not produced in human body, undigested fiber adds bulk to the food easing bowel movements. The enzymes that digests cellulose cannot bind to the cellulose due to altered active sites; undigested fiber adds bulk to the food easing bowel movements The enzymes required to digest cellulose are not produced in human body, fiber produces energy for the metabolism d Competitive inhibitors are not the reason that fiber is indigestible. W 74F 1464