If you are on this site I'm sure you can or have Googled the subject. The 3 things I keep hearing is exercise, don't smoke and a diet low in animal fats. I do 2 of the 3 (I love steak and bacon!).
Also, watch your stool for blood, unusual narrowing or black stool. Those things need to be discussed with a dr.
the one and most inportant is get a colonoscopy
they say start at 50 but if it runs in your family or you are real concern than you should get one. colon cancer is a very easy cancer to get rid of if you get your colonoscopy, they find poyls and remove them right there . my husband had one monday . they found 2 and removed them, if he had let them stay there he would of got cancer. colon cancer is very slow growing and if you get it early its cureable.