After studying national date from 1985 and 2007, University of Illinois researchers have found that car use correlates "in the 99-percent range" with national annual obesity rates. Lead researcher Sheldon H. Jacobson says, "If you look over the last 60-plus years, the automobile has become our primary mode of transportation — so much so, in fact, we have literally designed our way of life around it. It is that energy imbalance that ultimately may lead to obesity." The only solution: Bring back those Flintstones cars! (But not woolly mammoth showers. That's just gross.)
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