Yea, this is pretty much why a lot of America is obese and/or fat -- but there's hope

This is via Mother Jones by way of Amber Waves. This is Chart 1. It compares at-home spending patterns of U.S. households (i.e., at the supermarket) with USDA recommendations:

Now, here's Chart 2. It looks where Americans are eating -- fast food, restaurants, at home -- from 1977 to 1978 and then again from 2005 to 2008: