by Dr. Leo Galland
Fiber is the name given to complex carbohydrates that are resistant to human digestion. Examples of fiber include cellulose and pectin. Fiber comes from plants, and the usual sources are vegetables, cereals, bread, nuts, seeds and fruit.
Medical researchers have been recommending high fiber diets, yet dietary patterns in North America show no significant increase in fiber consumption from food. This means that the fiber intake of most people is far below recommended levels.