Do any foods act as antioxidants?

Some foods do contain high antioxidant properties.

A study which was conducted by researchers at the U.S. Department of Agriculture and Agricultural Research Service Center on Aging at Tufts University, examined the effect of fruits and vegetables ranking high in an antioxidant assay called ORAC. These active compounds are thought to reduce the risk of chronic diseases such as cancer, cardiovascular disease, and cataracts. The following fruits and vegetables rank highest in ORAC antioxidant power: prunes, raisins, blueberries, blackberries, strawberries, raspberries, plums, oranges, red grapes, cherries, kale, spinach, brussel sprouts, alfalfa sprouts, broccoli florets, beets, red bell peppers, onions, corn, and eggplant.