2. Tomatoes
Tomatoes are a rich source of lycopene, a powerful antioxidant. A Harvard study of more than 40,000 health professionals found that men who ate the most tomato-based foods decreased their risk of prostate cancer by 35 percent when compared to men who ate the least amount. Another study found that the odds of developing prostate cancer — especially aggressive prostate cancer — decreased with higher amounts of lycopene in the blood. Fifty milligrams of lycopene daily significantly raised the blood level of this beneficial antioxidant.