The Food Guide Pyramid of the United States government graphically represents official recommendations for what Americans should eat on a daily basis. Other countries have analogous graphic representations.
The food pyramid graphic is linked from http://www.nalusda.gov/fnic/Fpyr/pyramid.html.
Some foods may be classified in either of two groups. E.g.
Problem: some people interpret items at the top as being most highly desired.
Explore: The United States Department of Agriculture has provided an interactive food pyramid that expands upon and interprets the information in the graphic.