In my research and reading, I'm finding a lot of evidence for connection between a typical American/Western diet (which, admittedly, I started backing away from about 5 years ago), and colon cancer.

The subject of diet and cancer incidence at least bears checking out imho.  Here's a link for those who are interested in finding out more:

http://fightcolorectalcancer.org/dr_lenz/2009/01/avoid_western_diet