Dietary fiber and health. AMA council on Scientific Affairs.

During the last 18 years, considerable research has been conducted on the role of dietary fiber in health and disease. Interest was stimulated by epidemiologic studies that associated a low intake of dietary fiber with the incidence of colon cancer, heart disease, diabetes, and other diseases and disorders. Dietary fiber is not a single substance. There are significant differences in the physiological effects of the various components of dietary fiber. A Recommended Dietary Allowance for dietary fiber has not been established. However, an adequate amount of dietary fiber can be obtained by choosing several servings daily from a variety of fiber-rich foods such as whole-grain breads and cereals, fruits, vegetables, legumes, and nuts.