Why Salad Costs More than a Big Mac

I saw this in the October 2010 Reader's Digest and was disgusted all over again. To quote the article:

"A new report shows that the great American waistline continues to expand. In 1991, not a single state had an obesity rate above 20 percent, but now the rate tops 30 percent in eight states."

This graphic explains, in part, why this is the case, and also why healthy foods tend to cost more than that Big Mac. (Yet another reason to grow your own healthy food, in my opinion.)