Ethnic factors: China is a multi-ethnic country with 56 ethnic groups. The customs and lifestyles of all ethnic groups are different, not only in life activities, but also in food culture.
The eastern plain is inhabited by Han people, with suitable climate, fertile land and abundant water resources. It is called "Land of Fish and Rice", so rice and wheat are the main foods. Ethnic minorities with similar farming methods are Korean, Xibo, Dai, Zhuang and Dulong. Because of the cold climate, Mongolians, Oroqen, Nu people living in the north of China and Tibetans living in the southwest pastoral areas eat more high-calorie meat to resist the cold.
The eating habits in the south and the north of China are different. Southerners like to eat rice, while northerners like to eat pasta, which is actually related to the different agricultural production structures between the north and the south. The climate in southern China is hot and rainy, and most of the cultivated land is paddy fields. Local farmers plant rice with high temperature and rainy growth habits according to local conditions. However, there is less precipitation and lower temperature in northern China, and most of the cultivated land is dry land, which is suitable for the growth of drought-resistant and cold-resistant wheat.
The so-called "eat what you plant", in the long run, will develop the eating habits of the north and the south.
When it comes to the dietary differences between the north and the south, you may first think that the staple food in the south is rice and the staple food in the north is flour. But the northeast produces rice, which has a long reputation. It's quite interesting that the famous rice from the Northeast is mainly sold to other places, but I don't like it myself.