Many fried dishes can't be eaten and stored, especially some high-protein and high-fat leftovers. The harmful bacteria in the air will attach to the leftovers within 2 hours and start to multiply. As we all know, most protein and fat will produce harmful substances under the action of bacteria, such as hydrogen sulfide, amines, phenols and so on. It is harmful to human body.

And there is oil and salt in the fried dishes. After a night, the vitamins in vegetables were oxidized, and the content of nitrite increased greatly, which became nitrite after entering the stomach. Although nitrate is not a direct carcinogen, it is very harmful to health. When nitrite enters the stomach, it will produce a substance called NC(N- nitroso compound) under certain conditions, which is one of the risk factors of gastric cancer.

Especially when the weather is hot, overnight meals are contaminated by bacteria, which will multiply and easily lead to gastroenteritis and food poisoning.

Therefore, when we cook, the best way is to tailor it to suit our health.