Based on Epidemiological studies, all the following factors ours the development of colon cancer, except:

Insoluble fibres was found to decrease cell proliferation. Lignin a component of insoluble fiber is a free radical scavenger and was found to protect against colorectal cancer. Ref: Functional Foods, Ageing and Degenerative Disease By Claude Remacle, Brigitte Reusens, Page 634; Medical Care of Cancer Patients By Sai-Ching Jim Yeung, Page 296; Nutrition In The Prevention and Treatment of Disease By Ann M. Coulston, Carol Boushey, Page 68; Colorectal Cancer: A Scientific Perspective By Anne R. Kinsella, Page 41