If the mung bean soup is cooked and left to cool, covered with plastic wrap for processing, and refrigerated overnight in the refrigerator, and the mung bean soup does not appear to deteriorate or change in taste, it is drinkable for adults without digestive disorders. But usually, mung bean soup in cooked, to be cooled, in time to drink the taste is more delicious, nutritional value is also higher. However, if mung bean soup is left in the refrigerator overnight, without better preservation and sealing treatment, it may cause mung bean soup to deteriorate and produce toxic and harmful substances, so it is recommended not to drink it. The purpose is to prevent food poisoning or gastrointestinal bacterial infections that can cause gastrointestinal discomfort. In addition, because mung bean soup contains a certain amount of phenolic substances, this substance is exposed to the air for a long time, easy to be oxidized to produce quinones, mung bean soup placed in the refrigerator overnight, the antioxidant capacity and nutritional value will be reduced, and overnight mung bean soup is prone to deterioration breeding bacteria. Therefore, for people with gastrointestinal tract problems, drinking overnight mung bean soup in the refrigerator is likely to aggravate the gastrointestinal tract symptoms, may appear diarrhea, abdominal pain, so it is not recommended for such people to drink.