1, classified storage, cold dishes, hot dishes, meat dishes and vegetarian dishes should be classified storage.

2. It is better to leave leeks than vegetarian dishes, especially leafy vegetables, which contain a certain amount of nitrite, and the content will continue to increase after overnight.

3. The dishes that are not expected to be eaten should be put into the lunch box in advance to avoid leaving leftovers and reduce cross-contamination.

4. When eating again, it must be heated and heated thoroughly to achieve the purpose of sterilization.

5, must be placed in the refrigerator, avoid room temperature, overnight dishes that look bad and smell abnormal must be thrown away.

"Overnight dishes" does not only refer to dishes that have been left overnight. If they are left for more than 8-10 hours, they should be considered overnight. There are two reasons for the increase of toxic components in food. The first reason is that chemicals in food produce carcinogens, such as nitrite, which cannot be removed even if heated. Another reason is the secondary pollution caused by foreign bacteria when it is placed.

Extended data:

Harmful overnight dishes:

1, green leafy vegetables are the most dangerous overnight.

Usually, the nitrate content of stem and leaf vegetables is the highest, melon vegetables are slightly lower, and roots and cauliflowers are in the middle. Therefore, if you buy a lot of vegetables at the same time, you should eat leafy vegetables, such as Chinese cabbage and spinach. If you are going to cook more vegetables and eat them hot the next day, you should try to make fewer stem and leaf vegetables and choose melon vegetables.

2. Overnight seafood damages liver and kidney.

Seafood such as crabs, fish and shrimps will produce protein degradation products overnight, which will damage the liver and kidney function. If you really buy too much, you can pack raw seafood in fresh-keeping bags or boxes, freeze it in the refrigerator and cook it next time.

Recently, the saying that "overnight dishes cause cancer" has been heated up. Usually, the nitrate content of stem and leaf vegetables is the highest, melon vegetables are slightly lower, and roots and cauliflowers are in the middle. Seafood such as crabs, fish and shrimps will produce protein degradation products overnight, which will damage the liver and kidney function.

3. It is dangerous to put eggs for a long time.

Many people like to eat soft-boiled eggs, but this kind of eggs is not completely sterilized, and the eggs are rich in nutrition, which is particularly easy to breed bacteria and will be dangerous after eating. If the eggs are ripe and well preserved in a low-temperature seal, it is no problem to eat them overnight.

References:

People's Daily Online-What dish is the most dangerous overnight? Four kinds of overnight dishes are comparable to poison.

People's Network-Five Reminders for Eating Overnight Dishes