Taking out your whole colon is a dramatic recommendation, implying that either you have a terribly serious risk or a terrible doctor. It is the treatment of choice for those with the genetic marker for FAP.
Familial adenomatous polyposis (FAP) is a hereditary disorder. FAP causes you to develop thousands, of polyps in the lining of your colon beginning in your teenage years. If these go untreated, your risk of developing colon cancer by age 45 is nearly 100 percent. In some cases, genetic testing can help determine whether you're at risk of the disease.
I lost a dear friend to colon cancer. He was diagnosed two years after he got married and fought it for several years before he died at age 45. He had FAP.
I don't mean to scare you, but please take this seriously.