Interesting about that, is that when Asians come to the US where there is a greater variety of food, and more of it, it takes only one or two generations and the children are on average the same height.
Then when you go to Asia the tallest people are the leaders
Then you also have the half of the population of the opposite sex..
Likewise, when I was in Korea for four months in 1988, I did not see anyone as tall as me. But now, I would guess that a number of the next generation of Koreans are as tall.