It was in The Economist. It must be true.

I went down to the Idyllwild Library on my break one afternoon and sat in the back room mindlessly flipping through magazines. That's when I unearthed this magnificently audacious assertion:

"The fat, the impulsive and the untidy are genetically normal, but they are equipped for yesteryear. The thin, the focused and the neat are freaks—but they are cut out for success."

--From The Curse of Untidiness