Antioxidants and good health

We hear very often about the importance of antioxidants and the role they play in improving our health so I thought I would check the great Wikipedia and US government research sites to see if I could find some good info on the role that antioxidants play in good health and how to get them.
Antioxidants and good health

Antioxidants are present in foods as vitamins, minerals, carotenoids, and polyphenols, among others. Many antioxidants are often identified in food by their distinctive colors—the deep red of cherries and of tomatoes; the orange of carrots; the yellow of corn, mangos, and saffron; and the blue-purple of blueberries, blackberries, and grapes. The most well-known components of food with antioxidant activities are vitamins A, C, and E; ß-carotene; the mineral selenium; and more recently, the compound lycopene. target=

From: http://is.gd/MO9Y6a