Average height of Japanese born in 1980 or later is declining

While the average height of Japanese adults had grown some 15 cm (nearly 6 inches) over the past century with improved nutrition and public health conditions, it has started to decline for those born in 1980 or later, recent research has shown.

Fertility Rate, Total for Japan (SPDYNTFRTINJPN), FRED

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There is no article online that says the real truth on why average

Japan's average adult height declining for those born in 1980 or later

Human Height - Our World in Data

Japanese and South Korean men are getting shorter every year

More Japan Articles - The Japan Times

Human Height - Our World in Data

Japan's demographic time bomb, in one chart - Vox

How humans have changed in height in the last 100 years

Demographics of Japan - Wikipedia

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Mechanisms of Japan's Population Decline Unstoppable despite Countermeasures for Declining Birthrate

Japanese and South Korean men are getting shorter every year