It is not a definitive prevention and more research is needed to elucidate the health benefits. However, chocolate (the purer the better) may help keep the colon healthier.
"Chocolate is rich in a particular variety of plant polyphenols which are powerful natural antioxidants. Though many plant foods contain polyphenols, chocolate seems to have particular potent health-promoting and disease fighting effects. These compounds include procyanidins, catechins and epicatec...