Most registered dietitians advise against this. Adding a powder or pill to your regular diet will not make much of a difference. Besides, many fiber pills contain only small amounts of fiber, compared with the amounts found in foods. A word about beans Beans are packed with fiber, yet Americans have not been eager to eat more beans. Beans are such a valuable, healthful, and versatile food that it's worth the effort to learn more about them and to find ways to enjoy them on a weekly basis.
Registered dietitians hear two common complaints when they recommend beans.
They give me gas. Some carbohydrates in beans can make people feel gassy and bloated. When preparing dried beans, discard the soaking water and cook the beans in fresh water. The soaking water contains some of the gas-producing carbohydrates. Leave enough time to cook dried beans thoroughly, so they are easy to digest.