Soybean, black beans, mung beans, red beans and peanuts are mixed together to make soybean milk, which can make soybean milk taste better and nourish by going up one flight of stairs. However, if soybean milk is a soybean substance, such as soybeans and black beans, it must be cooked thoroughly before drinking. One of the characteristics of soybean food is that it contains some substances that must be cooked to be safe, such as trypsin inhibitor, lipoxygenase, plant cell lectin and so on. If the food containing these substances is not completely cooked, there will be symptoms of food poisoning, such as nausea and vomiting. Therefore, when cooking soybean milk, you must first boil the soybean milk with a big fire, and then cook it with a small fire for about 5 minutes before you can safely drink it.