Why are northerners taller than southerners? Is it because of environmental factors or the influence of climate?

It's mainly about latitude. The higher the latitude (north), the farther away from the equator, the colder the weather. People need to reduce the unit energy loss and increase the body surface area, so northerners are taller. On the contrary, southerners, close to the equator, have to reduce their body surface area in hot weather, so they are shorter. Just as the Northeast Tiger is much bigger than the South China Tiger, it is a truth. The first reason is the climate. Cold areas can stimulate human growth hormone more than warm areas, and because of the cold weather, people will eat more food, and of course they will grow taller more easily. Therefore, people in cold areas such as Russia and Yugoslavia are generally very tall, and northern China is no exception. The second is the diet structure. In the south, rice and pork are almost absolute staple foods, while in the north, most people are used to eating pasta and beef and mutton, which have different effects on bone growth and body shape. However, these are not absolute. In recent years, the average height of Japanese teenagers has increased rapidly. According to statistics, the average height of Japanese teenagers has surpassed that of our country, which is very unpleasant ~