Leather eggs are cured by mixing soda ash and limestone to wrap duck eggs and contain the heavy metal lead. Although eggs have high nutritional value, eating too many of them may cause indigestion, induce pancreatitis, cholecystitis, lead poisoning, etc. 1. indigestion: after processing, the vitamin A content of skin eggs decreases and the B vitamins are lost, which will accumulate in the body after eating too many of them, making them difficult to digest, causing stomach bloating and stomach pain, and leading to a decrease in appetite; 2. inducing pancreatitis and cholecystitis: skin eggs For people with a history of pancreatitis and cholecystitis, eating large amounts of eggs can induce acute attacks of pancreatitis and cholecystitis; 3, lead poisoning: in the process of pickling eggs, lead oxide is added. Excessive consumption of skin eggs can ingest a large amount of lead oxide, and the human body cannot metabolize lead elements in time, which may lead to lead poisoning in the body. Children are more sensitive to lead, and if they consume the amount of eggs that is safe for adults, the development of young children may still be adversely affected, which may manifest as low intelligence, slow reaction, inattention and other abnormalities; 4, unfavorable to people with low sodium diet: the sodium content in eggs is extremely high, which is a high-salt food. People with high blood pressure, pregnant women who are more prone to gestational hypertension and other people who need to control their sodium intake should be cautious about eating them.