Give Now

A Moment of Science

Evolving Height

How tall you are seems to be as much about nurture as it is about nature.

An outdoor basketball hoop at sunset

Photo: arturodonate (flickr)

While we are taller than we were 200 years ago, the NBA is not going to have to raise the official height of basketball hoops.

Unless you’re the starting center for a professional basketball team, chances are you don’t have to duck when walking into a room.

Shorter Back Then

But if you ever visit a house built around the time of the American Revolutionary War, you might very well have to duck even if your name isn’t Shaquille O’Neal. Houses built in 18th century America have smaller door frames and lower ceilings compared to modern buildings.

The fact is that we are, on average, about four inches taller than humans living in the 18th and early 19th centuries. Does this mean that we’ve evolved to become taller? Well, not necessarily.

Nutrition Is The Key

A more probable explanation has to do with nutrition. Consider the evidence. Human height remained fairly constant from the Stone Age through the early 1800s. Average height began to increase only as methods of producing and distributing food improved.

Even more convincing proof is that the trend can be reversed: during times of food shortage such as war, average height among deprived populations tends to decrease.

So does this mean that the more we improve nutrition, the taller we’ll get? Not exactly. While good nutrition has helped us reach our genetic potential for height, it doesn’t mean that if we keep improving nutrition we’ll evolve into an even taller species. Human height potential may have leveled off.

Read More:

  • http://growtalleracademy.com Mark Ashbel

    Read more about height variation in humans and how different environmental conditions affect height growth here:
    Grow Taller Academy

Stay Connected

What is RSS? RSS makes it possible to subscribe to a website's updates instead of visiting it by delivering new posts to your RSS reader automatically. Choose to receive some or all of the updates from A Moment of Science:

Support for Indiana Public Media Comes From

About A Moment of Science

Search A Moment of Science