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My best guess is some kind of correlation between left-leaners and better diets.  Utah, Wyoming, and Idaho have more right-leaning populations, and in my anecdotal experience, the hippie-libs tend to have more focus on diet and superior restraint in that department.  My father-in-law and his wife live in Colorado, and they definitely fit that bill. 

This is based on zero evidence or research whatsoever, and correlation is not necessarily causation.  As CD pointed out, there's the cities vs. rural thing, and that also corresponds to left and right-leaners.  Multi-collinearity, we call that in nerd stats. 

Doesn't help explain Florida.

Doesn't help explain Florida.

Florida is inherently superior, and everyone should move there.  

In my experience, there's just no explanation for Florida.

Meth heads are skinny. 

Meth heads are skinny.

That's not a big problem here. Cops are allowed to do their jobs and have cleaned that up over the years.

I looked askance at it too.  

Median home sizes.

I'd be interested in a "median car cubic foot" map as well, especially comparing the US to Europe.

Back when I was working as a final test engineer for Eaton Semiconductor, we had two reps from a Belgian customer coming in to Austin to do a final checkoff of the ion implanter we had built for them.  This was our standard "proof of capability" test here in the US, before it got torn down and shipped overseas to be rebuilt at their fab in Belgium, at which point I would go over there and spend the 2-3 months performing the final tests on-site for them. 

Anyway, I'd already met them once over in Belgium so I told my boss and the sales team I'd go pick them up at at the airport.  At the time I was driving a brand new 1995 Chevy Blazer and when we walked out to my car, their eyes got really, really big.  It was their first trip to the USA and they didn't know what our cars looked like.  They couldn't believe how large and luxurious it was. One of them said, "Never have I ever been in such a car."  And man, it was just a base trim model with cloth seats-- I'd bought it for the 4x4 and tow package.

But of course I'd been to Europe already and knew what they were accustomed to, so their reaction didn't surprise me.

Cars in Europe have gotten a lot bigger even over the past decade or so.  Cars in Japan are tiny, cars in Korea are about the same as here, but no light duty trucks there or in Europe (almost, I've see 3 or 4).  They use vans a lot for work vehicles so the stuff gets locked up.  Crime in France is pretty severe (theft).

In Europe, any single family house is surrounded by a significant fence front and back.