What is the recommended consumption of whole grains daily ?

Info source:

http://wholegrainscouncil.org/whole-grains-101/how-much-is-enough

The most recent Dietary Guidelines for Americans, released in January 2011, recommend that all adults eat at least half their grains as whole grains – that's at least 3 to 5 servings of whole grains. 

Note: A serving of whole grains is 16 grams (16g) of whole grain ingredients.

Even children need 2 to 3 servings or more. 

Recommendations in Canada's Food Guide are almost exactly the same. (Not surprising, since the human body changes little from country to country!)