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You are here: Home / Taller, Fatter, Older: How Humans Have Changed in 100 Years

Taller, Fatter, Older: How Humans Have Changed in 100 Years

· July 21, 2014 ·

Humans are getting taller; they’re also fatter than ever and live longer than at any time in history. And all of these changes have occurred in the past 100 years, scientists say. So is evolution via natural selection at play here? Not in the sense of actual genetic changes, as one century is not enough time for such changes to occur, according to researchers. Most of the transformations that occur within such a short time period “are simply the developmental responses of organisms to changed conditions,” such as differences in nutrition, food distribution, health care and hygiene practices, said Stephen Stearns, a professor of ecology and evolutionary biology at Yale University. [ 10 Things That Make Humans Special ] But the origin of these changes may be much deeper and more complex than that, said Stearns, pointing to a study finding that British soldiers have shot up in height in the past century. “Evolution has shaped the developmental program that can respond flexibly to changes in the environment,” Stearns said. “So when you look at that change the British army recruits went through over about a 100-year period, that was shaped by the evolutionary past.” And though it may seem… Read full this story

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Taller, Fatter, Older: How Humans Have Changed in 100 Years have 275 words, post on www.livescience.com at July 21, 2014. This is cached page on Vietnam Colors. If you want remove this page, please contact us.

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