Why are we so fat? The biggest factor in the increase in obesity is the decrease in smoking. Light up! I believe it even if it's not true. It should be true.
Smokers are less likely to be obese. And the declining use of cigarettes across the country -- due to both tightening pocketbooks and new laws (thanks, Mayor Bloomberg) -- accounts for a bigger increase in the obesity rate in the U.S. than any other factor, according to paper authors Charles L. Baum and Shin-Yi Chou, who have both written with some frequency on the economics of obesity.