date:Sep 26, 2021
d through a family. Dashwood explains that over decades, exposure to carcinogens through diet and environment can change the way genes are expressed in the gastrointestinal (GI) tract, and this can cause people to develop polyps in the colon and lower GI tract later in life that can progress into cancer. This is why the American Cancer Society recommends starting colon cancer screening at age 45.