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I suspect that "burger diversity" is just a proxy for wealth. The wealthier a county is, the greater the availability of healthy food. Plus you can probably afford a gym membership and/or can walk/jog/bike outside without worrying about being mugged.

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This seems very clearly to be a proxy for wealth, from the article "cheap burgers are more popular in high obesity counties". Map wealth to burger diversity and this result becomes far less interesting.

What IS interesting is the mapping between wealth and obesity. I'd love to see more data on that.

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