How much whole grains should you eat daily?

You keep hearing that you should eat more whole grains, but what are they? How much should you eat? 

Eating at least three or more one-ounce equivalents of whole grains daily can reduce the risk of some diseases, according to the 2005 Dietary Guidelines for Americans. These guidelines are published every 5 years by the U.S. Department of Health and Human Services and the U.S. Department of Agriculture.

"So if you want to do yourself some good, eating three or more servings of whole grains each day can help you achieve a healthy diet," says David Acheson, M.D., the Food and Drug Administration's (FDA) associate commissioner for foods.

Info source: http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm151902.htm