Steamed crabs kept fresh in the refrigerator overnight can be eaten if they are well preserved and do not appear to have deteriorated, but it is not recommended to eat them if there is discoloration, odor, and other deterioration. Although steamed crabs are well preserved after being kept fresh in the refrigerator overnight, they still need to be heated at a high temperature and eaten the next day. If you eat them directly after taking them out of the refrigerator, you may experience discomfort such as abdominal pain and diarrhea because crabs contain more protein and are also prone to bacterial growth when kept at low temperatures. High temperature heating can kill bacteria and other microorganisms very well, but the taste is not as delicious as the crab after the first steaming. And the deterioration of crabs taken out of the refrigerator the next day, such as discoloration and odor, is usually the result of the decomposition of crabs stored for a long time into histidine and histidine-like under the influence of microorganisms. To avoid food poisoning, it is recommended to stop eating them, and symptoms of poisoning such as nausea, vomiting, headache and dizziness may occur after consuming large amounts. Long-term consumption of overnight food is usually not recommended. Even if the food is placed in the refrigerator, it only reduces the rate of bacterial reproduction and does not prevent the occurrence of bacterial contamination. Contamination of food with pathogenic bacteria can cause some damage to the human gastrointestinal tract, in addition to the risk of food poisoning. In daily life, you can cook dishes according to the usual amount of meals to avoid leftovers from the root.