After Flammulina velutipes stays overnight, the vitamins and air inside are oxidized, which will greatly increase nitrite and turn into nitrite after entering people's stomach, which is extremely unfavorable to human health.

A large number of bacteria will continue to multiply, and the dishes will be put in the refrigerator overnight. Because they are wet for a long time, they will produce a lot of bacteria, so they must not eat overnight dishes.

Extended data:

1, bacteria multiply. People habitually put overnight dishes in the refrigerator, which will breed a lot of bacteria if they stay wet for a long time. When they continue to heat the next day, they can't completely kill the bacteria, which will lead to gastrointestinal diseases and even food poisoning in the long run.

2. Produce nitrite. The nutritional value of green leafy vegetables was destroyed overnight, and nitrite was also produced. As long as nitrite enters the stomach, it will form a strong carcinogen and induce the occurrence of gastric cancer.

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