As more people undergo plastic surgery, naturally there are more questions. Recently, many people have asked, can you eat soy sauce after a plastic surgery? I heard that eating soy sauce will make the wound black? In fact, as long as you think about whether it is reasonable, you will know that some of the statements are very ridiculous. So, will eating soy sauce after plastic surgery really make the wound black? In view of everyone’s confusion about this issue, the following article will introduce it to you. This statement has absolutely no scientific basis. Melanin in the skin is formed from tyrosine in melanocytes under the catalysis of tyrosinase. The amount of melanin is related to the amount of tyrosine (raw material) and the activity of the enzyme that produces melanin, both of which are indispensable. Data show that 100 grams of soy sauce contains 115 mg of tyrosine. Its tyrosine content is similar to that of milk, but far lower than the content in meat, eggs, fish, and shrimp foods. In other words, the amount of melanin produced by the skin after drinking soy sauce and drinking milk is almost the same. In fact, the color of soy sauce mainly comes from the caramel pigment it contains. The latter is produced from rice, sucrose, etc., through a caramelization and browning reaction under the action of high temperature, pressure, and catalysts. It is a widely used Pigments in beverages, soy sauce, and vinegar. So far, there are no relevant research reports that caramel pigment can promote melanin formation.