Antioxidants are substances that may protect cells from the damage caused by unstable molecules known as free radicals. Free radical damage may lead to cancer. Antioxidants interact with and stabilize free radicals and may prevent some of the damage free radicals might otherwise cause.  (taken from: http://www.cancer.gov/cancertopics/factsheet/prevention/antioxidants)

Food                                       Serving Size                          Total Antioxidant Capacity

1. Small red beans                1/2 cup                                   13,727

2.  Wild blueberries               1 cup                                       13,427

3.  Red kidney beans            1/2 cup                                   13,259

4.  Pinto beans                      1/2 cup                                   11,864

5.  Cultivated blueberries     1 cup                                       9,019

6.  Cranberries                      1 cup                                       8,983

7.  Artichoke hearts               1 cup                                       7,904

8.  Blackberries                     1 cup                                       7,701

9.  Prunes                               1/2 cup                                   7,291

10.  Raspberries                   1 cup                                       6,508

Also high on the list are strawberries, pecans, russet potatoes and Red Delicious apples.