Can a diet rich wit fat and carbs induce colon cancer

I have a theory that a diet rich in fats and carbs can induce colon cancer, or at least put a person who was already predisposed to getting colon cancer at risk. I know this was true for me; before me diagnosis, I was a regular consumer of fast food, and I was obese as well. I would like to encourage as many people as possible to eat healthier, and if you have any info about the statistics on this, or any good articles, I'd like to see them.