It is not recommended to eat the things just taken out from the refrigerator, because the temperature of the gastrointestinal tract is 36℃, and the temperature of the food taken out from the refrigerator should be 2-8℃, if you eat the food just taken out from the refrigerator immediately, it will lead to the gastrointestinal tract because of the low temperature stimulation, the gastrointestinal tract blood vessels and mucous membrane suddenly contraction, blood reduction, digestive juice secretion is reduced, resulting in the physiological dysfunction of the gastrointestinal tract and the weakening of the digestive function. Moreover, the secretion of gastric acid is also reduced, which may induce abdominal pain and diarrhea, and may easily lead to bacterial infection and inflammation of the gastrointestinal tract. In addition, food in the refrigerator, such as overnight leftovers, is not cooked by heating, it is easy to induce acute gastroenteritis because of the growth of bacteria. If it is cooked food, such as fruit and other fresh food that does not need to be cooked, it is also recommended that the patient is best able to put it at room temperature, and then take it when the temperature of the food is slightly close to the room temperature, which can reduce the stimulation of the gastrointestinal tract, so just take out of the refrigerator is not recommended to eat immediately.