Update 2012-08-30: old graph links decayed; replaced with other graphs of same data.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/82/USObesityRate1960-2004.svg/350px-USObesityRate1960-2004.svg.png)
Almost as many obese as healthy weight adults in the U.S., and the rest are overweight. Something changed starting about 1980.
Data source: Centers for Disease Control and Prevention (2005) Health, United States, 2005.
Graph source: Wikipedia
Blue Cross Blue Shield, with this accompanying text:
While the percentage of the U.S. population considered overweight has been stable since 1960-62, the percentage considered obese has more than doubled.
What happened?
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