According to an article written on Feb. 8, 1999, on the USDA Agricultural Research Service website, these fruits and vegetables may show promise in the slowing the effects of aging:

ORAC (Oxygen Radical Absorbance Capacity) units per 100 grams (about 3 ½ ounces)

Fruits	 
Prunes	5770	
Raisins	2830	
Blueberries	2400	
Blackberries	2036
Strawberries	1540	
Raspberries	1220	
Plums	949	
Oranges	750	
Red grapes	739	
Cherries	670	
Kiwi fruit	602	 	 
Grapefruit, pink	483

Vegetables
Kale	1770
Spinach	1260
Brussels sprouts	980
Alfalfa sprouts	930
Broccoli flowers	890
Beets	840
Red bell pepper	710
Onion	450
Corn	400
Eggplant	390
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