Does a high-fiber diet prevent colon cancer in at-risk patients?
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There is no direct evidence of an effect of dietary fiber on colon cancer incidence. A diet high in fiber has not been shown to be effective in the short-term (2- to 4-year) prevention of recurrent colon polyps (strength of recommendation [SOR]=A, based on consistent randomized clinical trials). Furthermore, epidemiological evidence is inconsistent in demonstrating an association between dietary fiber consumption and the occurrence of colon cancer (SOR=C).
Journal of Family Practice, 52(11) 2003: 892-893.