Monosodium glutamate is the main component of MSG, it is mainly used to increase the freshness of food, and is a common condiment in the home, and a small amount of consumption is generally not harmful to the body. However, for infants and young children, if a large amount of MSG is consumed, it will turn the zinc in the blood into zinc glutamate, which will be excreted from the urine, thus leading to acute zinc deficiency in infants and young children. The lack of zinc may lead to mental retardation, night blindness, late sexual maturity, dwarfism, etc. Therefore, infants and children must not consume too much MSG. Among liver diseases, for hepatic encephalopathy, monosodium glutamate was also used in the past to treat hepatic encephalopathy, but this treatment has been abandoned.