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Colon cancer prevention guide

Step 2. Reduce Fiber Consumption

Dietary fiber in processed food, supplements, and laxatives is a potent carcinogen and the primary cause of the intestinal mucosa's inflammation — a condition that commonly precedes colorectal cancer. And despite what most people believe, dietary fiber doesn't offer any protection from colorectal cancer:

Letter Regarding Dietary Supplement Health Claim for Fiber With Respect to Colorectal Cancer

“Based on its review of the scientific evidence, FDA finds that (1) the most directly relevant, scientifically probative, and therefore most persuasive evidence (i.e., randomized, controlled clinical trials with fiber as a test substance) consistently finds that dietary fiber has no effect on incidence of adenomatous polyps, a precursor of and surrogate marker for colorectal cancer; and (2) other available human evidence does not adequately differentiate dietary fiber from other components of diets rich in foods of plant origin, and thus is inconclusive as to whether diet-disease associations can be directly attributed to dietary fiber.

FDA has concluded from this review that the totality of the publicly available scientific evidence not only demonstrates lack of significant scientific agreement as to the validity of a relationship between dietary fiber and colorectal cancer, but also provides strong evidence that such a relationship does not exist.”

U.S. Food and Drug Administration
Center for Food Safety and Applied Nutrition Office of Nutritional Products, Labeling, and Dietary Supplements;
October 10, 2000

Although the recommendation to reduce fiber consumption may appear counterintuitive, the  exclusion of processed fiber from the diet reduces the risk of colorectal cancer more than any other preventative action.

The following properties of dietary fiber contribute to the oncogenesis of the cancers of the colon and rectum: