Mine was due to celiac disease which went most of my life undiagnosed because doctors don't look for the root cause, they love to just make money off your symptoms. So for me, gluten is a major factor. I've also found I can't tolorate any grains at all so I avoid them all. I was symptomatic from my polyps all my life, constant bleeding issues, black stool, the works. It all stopped when I changed my diet. On top of that I don't eat or drink anything artificial that is known to contribute to cancer and I don't eat anything processed. Whole veggies and meats only. And I grow much of it myself. I've done everything I can to reduce my cancer risk.