Because cold salad has been polluted in the process of processing, many condiments will be added in the process of cold salad. Eating it overnight will lead to poor taste and sour and bitter taste.

Bacterial growth will occur in cold salad overnight, and at this time, the nitrate component in the dish will be transformed into nitrite. Eating this kind of food for a long time will lead to obvious symptoms of gastrointestinal discomfort. Some people may think that overnight cold salad can reduce bacteria as long as it is heated. Heating overnight cold salad will not only affect the taste, but also affect people's health, so don't eat overnight cold salad.