"Lutein is an antioxidant found in carotenoid-rich foods, Francis said. "But before we talk about lutein, we first must understand carotenoid-rich foods. These foods contain a yellow pigment and include dark green, yellow and orange foods. If it is still difficult to remember, think carrots. The antioxidants found in carotenoid-rich foods help gather light pigments or colors that help protect your body's cells from UV light and oxygen. Carotenoids are like sunblock for the cells in your body."