Fiber can reduce risk of colon cancer

Fiber versus Colon Cancer - How Foods Fight Cancer

Fiber has another function you should know about. It may reduce your risk
of colon cancer. Fiber moves intestinal contents along, so that whatever
carcinogens (that is, cancer-causing chemicals) may be lurking in your
waste products are escorted out of the body more quickly.

Carcinogens don’t just come from factory waste and air pollution; they
are sometimes present in foods. For example, when chicken, fish, or red
meat is cooked at a high temperature, cancer-causing chemicals called heterocyclic
amines tend to form as the protein molecules and other parts of
muscle tissue are distorted by the intense heat. Needless to say, that is
another good reason to avoid these products. However, the bile your body
produces to digest fats can also encourage the production of carcinogens.
A high-fiber diet helps move these compounds out of your body.