Hairy beans are undercooked and can cause poisoning when eaten. Hairy beans are a relatively common bean food in life, which is rich in protein and a variety of amino acid substances, eat hairy beans to help promote human health and improve immunity. However, when eating beans, must be cooked before eating. The uncooked beans will contain substances such as hemagglutinin and antitrypsin, which are absorbed by the body and can make the red blood cells in the blood coagulate, causing physical discomfort. The antitrypsin can inhibit the activity of protease in the stomach, which will not only lead to indigestion, but also cause enlargement of the pancreas, which will affect human health when it enters the body, and even cause toxic reactions, leading to nausea, vomiting, abdominal pain, diarrhea, dizziness, headache, numbness of the limbs and other symptoms. But as long as the beans are cooked before eating, these toxic substances will lose their activity and therefore will not affect human health.