What are the main factors that affect China's food culture?

China has a history of 5,000 years, and its food culture is extensive and profound, which is mainly influenced by natural environment products, folk culture, historical culture and climatic conditions. Gradually formed a hot and humid southwest, eating more bacon in the north, eating more salty seafood in coastal islands, and eating more hot and sour alkaline food in salt-deficient areas. From north to south, the taste tends to change from salty to light; From west to east, the taste gradually changed from spicy to sweet; From land to sea, the taste is from heavy to light, forming a big pattern of different tastes in the north and south.