Here is something that I am embarrassed I didn’t catch before – the strong correlation between height and obesity in the NHANES data.

Even with a linear relationship the correlation is strong

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With a second order polynomial it becomes striking

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What makes this particularly interesting is not only how tight the correlation is but that the two are currently negatively correlated in the cross sectional data but I suspect in the past they were positively correlated.

So one very naive interpretation is that you have a single driving force but that it manifests in some as height and in others as increased body mass. I hope to have more to say on this later this week, schedule permitting.

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