Confucius advocated "eight don't eat"-"eat buttons, fish will be hungry and meat will be defeated, and don't eat. Evil color, no food. Smelly, do not eat. No food, no food. From time to time, there is no food. Don't eat it if it's not cut properly. No sauce, no food. Selling wine in the market, not eating. "

These eight kinds of food are divided into three categories: first, color and taste: if the food changes color, it will not be eaten, and if it changes taste, it will not be eaten. Second, food quality: don't eat old food, fish and meat are not fresh, and stale vegetables are not eaten. Third, production: do not eat uncooked food, do not eat food without proper seasoning, do not eat wine and cooked meat bought from the market (meaning there are fakes).