First, foreigners still have to eat vegetables. What is the ratio of meat to vegetables? Everyone has his own scientific basis. Only people in China are overwhelmed by the concept of "health preservation" in Chinese medicine, especially boasting about the health preservation function of vegetarian dishes. Second, "getting angry" comes from the erroneous interpretation of complex human physiology by vulgar five-element philosophy. In fact, most of them are mild inflammation and can heal themselves. Third, the phrase "if you don't eat green for three days, there will be sparks in your stomach" belongs to mass hysteria. In border pastoral areas and plateau areas, it is difficult for residents to buy fresh vegetables. They still have to live year after year and don't talk about being angry. To put it bluntly, "I will get angry if I don't eat green vegetables" is just a psychological suggestion and a coquetry.