The final factor to great colon health is... FOOD! I'm giving you links to two really great diets. Both are essentially the same. Again, the important thing here is to stop doing the things that make you sick and start doing the things that make you healthy.
The first link is to Dr. Joel Fuhrman's website. His diet and lifestyle plan is called "Eat to Live." I have the book, I've tried the yummy recipes, I live this way (except for occassional slip-ups). http://www.drfuhrman.com/