Role of psychological factors, beyond class and geography:
"Earlier this year, I spent a month in Southern Sudan. Returning to the US has many culture shocks - overpowering media environment being one. But the most striking was the preponderence not only of obese people, but people of all classes who were clearly overweight.
"I live in Rochester, upstate NY which I consider a small midwestern city. The class lines referred to in your post are easily visible and confirmed. But I'd add one other possible obesity factor that likely traverses class lines: depression. No data, but I would guess that people who are depressed or anxious most often turn to food to soothe those beasts. Perhaps there's also a subtle factor of reaction to our Calvinist, repressive cultural history when it comes to sensual pleasure; food is allowed."
The Eskimo angle:
"I live in a predominantly Yup'ik Eskimo part of the world, where education levels are typically lower and the consumption of junk food has led to rapidly increasing rates of diabetes.Overweight and obese are the norm here, and not just among Yup'iks....
"Another indicator from here: the used-clothes boutique has literally tens of feet of rack space for large, large clothes, about one foot or less for what one would consider small sizes.A doctor friend says the medical community has to redefine normal, since official normal does not represent most people...
"I recently took a trip to Kansas City - which appears periodically in those lists generated somewhere of most-obese cities - and was struck by how few overweight people I was seeing. In fact, it was notable to me how fit most people looked, whereas here it is just the opposite. I was surprised."
From a British friend in Shanghai:
"I'm not surprised you are surprised not to see so many obese people. The world is enjoying the conversation about an 'obesity epidemic' and technically America tops the scales which gives the rest of us a chance to enjoy a seeming superiority. Whether or not that situation has changed in America and whether or not the situation for the rest of us has changed (in Europe, China or wherever getting fatter) doesn't matter. It's become a truism that Americans are fatter in greater numbers. This belief is held on to by both a) foreigners who like to have a dig at the US whenever we get a chance and b) ex-pat Americans who take the ex-pat view of all ex-pats that the country they come from has gone to the dogs since they left it. As you've been mixing with both foreigners and ex-pat Americans for several years in China you've probably let your guard down a bit and allowed it all to seep into your consciousness as it sort of seems right. Therefore when you return and are re-immersed in American life your unconscious assumption made while overseas is challenged.
"Or, maybe you just need glasses!
"Seriously though, it is interesting how many myths, stereotypes and assumptions you make about your own society while out of it for even a relatively short time.
"Therefore the question is not really what happened to America's weight, good or bad, but what happened to James Fallows while he was away!"
Ah, that last line opens up some questions that reach far beyond the obesity theme... For now I'll say that I will return shortly to the ever-pressing boiled frog and slippery slope debates. And I will add, after yesterday's set of obesity maps, that a wonderful site for visualized data in general is FlowingData.com -- eg with this set of charts about making sense of flight delays. Nothing to do with body weight but interesting nonetheless. Thanks to Parker Donham for this lead.