Consuming at least one apple a day can cut your odds of colon cancer by 35 percent. Why? Apples are rich in disease-fighting polyphenols, Which may block cancer cells from flourishing. Don't try to peel the fruit, the most polyphenols can be found in the rind. But an apple a day is not just your natural colon cleanse, it lowers risk of a heart attack. The pectin in the fruit helps reduce cholesterol.