We have changed our lifestyles and eating habits -- being more active and having more fruits, vegetables and fiber. -- S.C., ChicagoDEAR S.C.: It is difficult to learn that one is at increased risk for any cancer. These are all associated with decreasing your risk of colon cancer. Nitrites are often used as food additives in cured meat products to decrease the risk of botulism. One other side note: Chronic constipation is a risk factor for colon cancer.