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.

Average Height in Japan 2024 - Wanna Be Taller

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

Fertility Rate, Total for Japan (SPDYNTFRTINJPN), FRED

Japan - Population growth 2022

คนญี่ปุ่นสมัยสงครามโลกที่เขาบอกว่า ยุ่นเตี้ยนี่ สูงกันประมาณเท่า

เรามีโอกาสได้คุยกับคนญี่ปุ่น เขาบอกว่าประเทศอื่น

喜多川——極高讚譽與極被抵制的兩極人生- 每日頭條

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

Why were the Japanese so short before 20th century? The average Japanese height in WW2 was around 150 cm. Why? - Quora