The saying that pork and beef should not be eaten together has a long history. "Yin Zheng Yao" (Important Principles of Food and Drink) states: "Pork should not be eaten with beef." This is mainly from the perspective of Traditional Chinese Medicine. From the perspective of medicinal properties, pork is sour, cold, and slightly cool, with a greasy and yin-cold nature. Beef, on the other hand, is sweet and warm, able to tonify the spleen and stomach, strengthen the waist and legs, and has the effect of calming the middle and replenishing qi. One is warm and the other is cold; one tonifies the middle and stomach, while the other is greasy and weakens a person. Their natures and flavors are in conflict, so they should not be eaten together. 2. Pork and Sheep Liver
Traditional Chinese Medicine says: "Eating pork with sheep liver causes one to feel chest tightness." This is mainly because sheep liver has a bitter and cold nature, tonifying the liver, improving vision, and treating liver wind deficiency heat. Pork is greasy and 'produces damp-heat in the stomach.' From the perspective of medicinal properties, the combination is not suitable. Sheep liver has a strong smell, and when stir-fried with pork, it easily produces a strange flavor. From a culinary perspective, it is also not suitable. 3. Pork and Soybeans
From the perspective of modern nutrition, beans and pork are not a suitable combination because beans have a high content of phytic acid, with 60%-80% of phosphorus existing in the form of phytic acid. It often forms complexes with proteins and mineral elements, affecting their availability and reducing utilization efficiency. Additionally, minerals in beans, such as calcium, iron, and zinc, bind with those in lean meats like pork and fish, thereby interfering with and reducing the human body's absorption of these elements. Therefore, pork and soybeans are not a suitable combination, and stewing pig's trotters with soybeans is an inappropriate pairing. 4. Pork and Coriander
Coriander is pungent and warm, consuming qi and harming the spirit. Pork is greasy, promoting damp-heat and producing phlegm. Ancient books record: "All meats are nourishing, except for pork, which has no nourishing effect." One consumes qi, while the other has no nourishing effect. Therefore, consuming them together is harmful to the body. Coriander, also known as cilantro, can remove gaminess and is suitable to eat with mutton.