A diet high in fiber-rich foods, such as berries and seeds, may help lower the risk of colorectal cancer. Courtesy of C the Signs/Tomas Llamas Quintas via Getty Images Fiber is a key nutrient for preventing colon cancer and supporting a healthy gut microbiome. Adding a few high-fiber foods to your daily rotation can help you hit the recommended dose. A doctor specializing in cancer prevention said her top high-fiber hacks include snacks and smoothies. As colorectal cancer is on the rise amo...