Brightly colored bell peppers, whether green, red, orange or yellow, are rich sources of some of the best nutrients available. To start, peppers are excellent sources of vitamin C and vitamin A (through its concentration of carotenoids such as beta-carotene), two very powerful antioxidants. Bell peppers also contain folic acid and provide fiber that can help lower high cholesterol levels, another risk factor for heart attack and stroke. For people worried about colon cancer, the fiber found in peppers can help to reduce the amount of contact that colon cells have with cancer-causing toxins found in certain foods or produced by certain gut bacteria. In addition, consumption of vitamin C, beta-carotene, and folic acid, all found in bell peppers, is associated with a significantly reduced risk of colon cancer. Red, Green, Orange and Yellow Peppers are great in salads and healthy stir-fries.