People have grown taller over the last century, with South Korean women shooting up by more than 20 cm on average, and Iranian men gaining 16.5 cm. A global study looked at the average height of 18-year-olds in 200 countries between 1914 and 2014. The results show that while Swedes were the tallest people in the world in 1914.
Dutch men have risen from 12th place to the top spot with an average height of 182.5 cm. Latvian women, meanwhile, rose from 28th place in 1914 to become the tallest in the world a century later, with an average height of 169.8 cm.
A little extra height brings a number of advantages says Elio Riboli of Imperial College." Being taller is associated with longer life expectancy," he said." This is largely due to a lower risk of dying of cardiovascular(心血管的)disease among taller people."
But while height has increased around the world, the trend in many African countries causes concern, says Riboli. While height increased in Uganda and Niger during the early 20th century, the trend has reversed(反转) in recent years, with height decreasing among 18-year-olds.
"One reason for these decreases in height is the economic situation in the 1980s," said Alexander Moradi of the University of Sussex. The nutritional and health crises led to many children and teenagers failing to reach their potential height.
James Bentham, a co-author of the research from Imperial College, believes the global trend of increasing height is of great importance. "How tall we are now is strongly influenced by the environment we grew up in," he said. "If we give children the best possible start in life now, they will be healthier and more productive for decades to come."
