Green beans are a vegetable that people generally love to eat. However, incorrect cooking methods may cause kidney bean poisoning. Recently, more than 160 employees of an electronics company in Xiamen suffered from collective food poisoning. The culprit was undercooked green beans. For this reason, experts remind people: Autumn and winter are the times when beans are on the market in large quantities, and people should pay attention to preventing kidney bean poisoning. French beans are also called beans, kidney beans, plum beans, kidney beans, etc. depending on the region. They contain two toxins, namely hemagglutinin and saponin. They are irritating to the gastrointestinal tract and can cause agglutination and hemolysis of human red blood cells. These two toxins are not terrible. As long as they are heated to above 100°C and the green beans are thoroughly cooked, their toxins will be destroyed. If the processing method is improper and the toxins are not completely destroyed, kidney beans can easily cause poisoning after entering the human body. Some collective canteens have small pots but process a lot of green beans, which cause uneven stir-frying and uneven heating, making it difficult to remove toxins. Some chefs like to blanch green beans in boiling water first, and then fry them in oil. They mistakenly think that heating them twice is safe. In fact, the toxins cannot be destroyed even if they are not heated thoroughly twice. Some chefs are greedy for the beautiful color of the green beans, and are afraid that the green beans will become soft after being cooked through and will not taste crisp, so they do not heat and cook them thoroughly. These are common causes of poisoning caused by insufficient heating of green beans. The incubation period for kidney bean poisoning is generally 30 minutes to several hours. The main symptoms of poisoning are gastroenteritis, mainly nausea, vomiting, and abdominal pain. Some people may also experience dizziness, headache, sweating, chills, numbness of limbs, diarrhea, etc. Those with mild symptoms do not need treatment. The symptoms will disappear on their own after vomiting and diarrhea. Those with severe symptoms should be sent to the hospital for treatment immediately. They will usually return to health within a few hours or a day or two. Experts point out that the method to prevent kidney bean poisoning is actually very simple. As long as all the kidney beans are cooked and simmered thoroughly, poisoning will not occur. The amount of green beans in each pot processed in the collective canteen should not exceed half of the pot capacity. After frying with oil, add an appropriate amount of water, cover the pot and simmer for about 10 minutes, and use a shovel to constantly turn the green beans so that they are heated and cooked evenly. through.