Blueberries, walnuts, sunflower seeds, kale, spinach... even coffee. What do these foods have in common? They're rich in antioxidants. Packing plenty of antioxidant-rich foods into your diet can help your body fight off free radicals (substances that can create damage leading to a number of chronic conditions).

It's important to choose a variety of healthy foods, as different types of antioxidants are thought to work in different parts of the body. Next time you're shopping in the produce section, think of the rainbow. Deeply colored fruits and vegetables from different color categories tend to be rich in different nutrients. It's not a hard and fast rule, of course -- but it's a simple guideline to help you get a variety of nutrients.

Take this quiz to test your antioxidant know-how.