Because some green leafy vegetables contain more nitrate, if they are left for too long after cooking, nitrate will be reduced to nitrite under the decomposition of bacteria, which is carcinogenic and cannot be removed by heating.

Seafood such as crab, fish and shrimp will produce protein degradation products overnight, which will damage liver and kidney functions. If you really buy too much, you can put raw seafood in a fresh-keeping bag or box, freeze it in the refrigerator and cook it next time.

Preservation of overnight meals

1, stored at low temperature

When stored in the refrigerator at 4 degrees, it can inhibit the growth and reproduction of microorganisms, inhibit the activity of nitrate reductase and reduce the production of nitrite. Many literatures have studied the effects of storage time and storage conditions on nitrite content of vegetables, and the conclusion is that cold storage can greatly reduce nitrite production.

2. Don't turn it over.

Dishes that can't be eaten should be put aside in advance, and then stored in the refrigerator. Don't turn them over for a long time. The more vegetables are turned over, the greater the chance of being infected with microorganisms. This can well control the generation of nitrite and ensure the safety of leftovers.

People's Network-Is it harmful to eat overnight dishes? How to deal with not wasting?