Europeans are getting taller and taller...

...and Americans aren't. An article in The New Yorker from two years ago details a study of height differences in people around the world.

Over the past thirty years, a new breed of “anthropometric historians” has tracked how populations around the world have changed in stature. Height, they’ve concluded, is a kind of biological shorthand: a composite code for all the factors that make up a society’s well-being. Height variations within a population are largely genetic, but height variations between populations are mostly environmental, anthropometric history suggests. If Joe is taller than Jack, it’s probably because his parents are taller. But if the average Norwegian is taller than the average Nigerian it’s because Norwegians live healthier lives. That’s why the United Nations now uses height to monitor nutrition in developing countries.

In the nineteenth century, Americans were the tallest people in the world. But in the mid twentieth century, something strange happened.

While heights in Europe continued to climb, Komlos said, “the U.S. just went flat.” In the First World War, the average American soldier was still two inches taller than the average German. But sometime around 1955 the situation began to reverse. The Germans and other Europeans went on to grow an extra two centimetres a decade, and some Asian populations several times more, yet Americans haven’t grown taller in fifty years. By now, even the Japanese—once the shortest industrialized people on earth—have nearly caught up with us, and Northern Europeans are three inches taller and rising.

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