Drinking orange juice morning, noon, and night can help raise and keep antioxidant levels consistent in your bloodstream. This, in turn, may help keep you protected from free-radical damage all day. It's not just the vitamin C in the juice that's beneficial; the less-touted carotenoid cryptoxanthin in OJ has been associated with a 15 percent to 31 percent reduced lung cancer risk.

Drinking three 8-ounce glasses of orange, apricot, or papaya juice per day is ideal for raising your levels of antioxidants, including the carotenoid cryptoxanthin, and lowering your risk of chronic conditions. Just remember that juice is high in calories, so you may need to adjust your diet overall. In a recent study, researchers discovered that drinking about 8 ounces of ready-to-drink commercial orange juice three times per day for 3 weeks raised participants' blood levels of vitamin C by 59 percent, folate by 46 percent, carotenoids by 22 percent, and flavanones by 800 percent. Eat a variety of red, orange, yellow, green, and purple fruits and vegetables; different colors of produce tend to be high in different health-promoting nutrients.