Why are boys in Guangxi short?

Shortness of boys in Guangxi is a genetic problem.

There are several reasons that affect height:

I. Geographical location and climate. I read a report that the height of residents in the first line of 35-43 degrees north latitude is higher than that in other latitudes, and Shandong Province of China is in this area. Where the latitude is too high, the climate is too cold. In the process of evolution, people need to reduce the heat dissipation area of the skin and increase the subcutaneous fat, so the indigenous people at high latitudes will not be too high. Only human migration and hybridization and improvement of living conditions can change this state. On the contrary, the farther you go to the equator, the shorter you get in hot weather (take China's northern hemisphere as an example).

Second, height genes, genes have a decisive impact on people's height. Chinese civilization originated in the Yellow River valley, and the height of Han ancestors in the Yellow River valley was generally higher than that of southern minorities (Kong Chunqiu's height exceeded 1.90cm at the end of the spring and autumn period, and he is considered a master in today's south). Because of wars, natural disasters and other reasons, the Han nationality migrated to all directions, intermarried with local aborigines, multiplied for thousands of years, and continued and developed Chinese civilization.

Third, climate and eating habits, geographical location determines eating habits. Wheat is planted in the north and rice is planted in the south. Wheat is more nutritious and easier to absorb and digest than rice. The winter in the north is long and the climate is cold, which requires a lot of animal fat and heat. The climate in the south is hot and the appetite is poor in summer. I like to eat porridge and soup, so it is definitely worse to absorb nutrition the day after tomorrow.

Fourth, genetic defects. Many people don't know a kind of congenital anemia caused by genetic defect: thalassemia! Hunan, Jiangxi, Guangxi, Guangdong and Hainan are high incidence areas of thalassemia in China. According to statistics, 20% of people in Guangxi are thalassemia gene carriers.