1. Alum is rich in aluminum ions. After excessive consumption of alum, most aluminum ions will be absorbed by the human body through the digestive system and form crystals and precipitates in local organs and tissues.

2. It will not only increase the risk of gallstones such as gastrolithiasis, kidney calculi's disease and bile duct stones, but also cause food poisoning or other food-borne diseases.

3. When the aluminum ion content in the human body is too high, it will affect the absorption of other trace elements such as calcium, iron and zinc, which will not only easily cause symptoms of water and electrolyte disorder, but even cause serious secondary diseases such as premature osteoporosis, septicemia and brain injury. Liver and kidney are the main detoxification organs of human body. Excessive consumption of alum will increase the functional burden of these organs and easily lead to organ damage diseases such as liver cirrhosis and renal failure.