Honey-Melon - Orange Fruits and Vegetables. Carotenoids are the powerful phytochemical in orange foods, and they are what give the foods their color. Carotenoids repair DNA and help prevent cancer and heart disease, as well as strengthening our vision. These orange foods also give us the right amount of vitamin A, which keeps our eyes and skin healthy, and protects against infections. They are also known to boost the immune system.