Causes of dietary differences between northern and southern Alps residents.

1. Geographical factors: Different latitudes and land and sea locations have created different climatic conditions in different regions of China. The climate in the south of China is hot and humid, which is rich in rice, so rice is the staple food, while the climate in the north is relatively dry and cold, which is suitable for the growth of crops such as wheat, so flour is the staple food.

2. Ethnic factors: China is a multi-ethnic country with 56 ethnic groups, and each ethnic group has different customs and lifestyles, so they not only have differences in life activities, but also have their own characteristics 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.

3. Habits: Southerners like rice and rice noodles, while traditional northerners (North China and Northwest China) like pasta. Judging from the quantity of food, most foods in the south are small and refined. The north is rich and thick.