This is related to the five elements. Beef is a hot and dry food, and it is a tonic. People who exercise too much can eat more beef to improve their physique. Pork is also red meat, not an auxiliary material. In Islam, we don't eat pork, saying that pigs are obscene and lowly. In short, it's a mess. Hui people say that pigs save their ancestors and don't eat them. In short, these two kinds of meat can be eaten for a long time.