Randomized trial of intake of fat, fiber, and beta carotene to prevent colorectal adenomas

Abstract

Background: Epidemiologic evidence of associations between the high intake of fat and low intake of dietary fiber, beta carotene, and other dietary constituents and the risk of colorectal neoplasia has been inconsistent and has not provided a sufficient basis for recommendations concerning the dietary prevention of large-bowel cancer in humans. Purpose: We conducted a clinical trial to assess the effects on the incidence of adenomas of reducing dietary fat to 25% of total calories and supplementing the diet with 25 g of wheat bran daily and a capsule of beta carotene (20 mg daily). Methods: We performed a randomized, partially double-blinded, placebo-controlled factorial trial in which half ..