Alum is rich in aluminum ions, which will be absorbed by the body through the digestive system and form crystalline precipitates in local organs after excessive consumption. In addition to increasing the risk of stomach stones, kidney stones, bile duct stones and other stone diseases, it can also cause food poisoning or other foodborne diseases. Excess aluminum ions in the body will affect the absorption of calcium, iron, zinc and other trace elements, which will not only cause water-electrolyte disorders, but also cause serious secondary diseases such as premature osteoporosis, sepsis and brain nerve damage. The liver and kidneys are the main detoxification organs of the human body. Excessive consumption of alum will increase the functional burden of the above organs, easily causing liver cirrhosis, kidney failure and other organ damage diseases.