Here is a much longer article on the same guy's research:Professor John Komlos, of the University of Munich, analysed data from the last 200 years for around 250,000 people.
He found that while Europeans are getting increasingly taller, Americans have "stopped growing."
In the 1800s, the Dutch were, on average, three inches shorter than Americans - now they are around three inches taller.
Immigrants, and people of either Hispanic or Asian ancestry were not included in the study.
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.