First of all, we need to know what substances will be produced by leftovers after meals?

1, microorganisms are easy to breed in food.

China people's eating habit is to hold food with chopsticks and then put it in their mouths. This process can easily bring bacteria from the mouth into the food. When the weather is hot, these bacteria are easy to multiply, causing gastroenteritis and serious food poisoning. On the other hand, repeated heating of leftovers can kill bacteria in leftovers, but the chemical toxins produced by bacterial decomposition cannot be eliminated, which is harmful to human body.

2. Leftovers are easy to accumulate nitrite.

As we all know, green leafy vegetables separated from meals are easy to produce nitrite. Nitrite is also one of the recognized carcinogens, and it is a national 2A carcinogen. A small amount will not directly cause cancer, but people who have the habit of eating leftovers will increase the risk of gastric cancer if they consume too much nitrite for a long time.

How to correctly preserve overnight dishes?

Seeing that the Chinese New Year is coming, New Year's Eve dinner is indispensable, and it is especially easy to have leftovers. Must these leftovers be thrown away? Especially for some office workers, it is inevitable to cook lunch the next night and take it to work the next day. Is overnight food really "toxic"? In fact, the harm of overnight dishes is also controllable. As long as the harmful substances easily produced in leftovers are well controlled, overnight dishes can also be eaten. How to control the harm caused by overnight dishes? Here are some ways to teach you:

1, try not to leave any food.

As we all know, in the process of diet, 80% of nitrate ingested by human body comes from vegetables. Therefore, in the process of choosing overnight dishes, try not to leave vegetables, and you can leave meat dishes. In the process of continuous heating, meat and vegetables may cause losses to nutrient B, but the damage to main nutrients such as protein is not great.

2. Try to keep melons and vegetables for leftovers.

Although vegetables are easy to produce nitrite overnight, not all leftovers will produce high content of nitrate. Among them, the food made of bean products and melons and vegetables contains less nitrate, so there is no need to worry about excessive nitrate accumulation when stored overnight. Such as beans, cucumbers, tomatoes, onions, etc. It should be emphasized that it is best not to leave leafy vegetables, which are most likely to lead to nitrate increase under long-term cooking.

3. Avoid microbial pollution

For those who cook too many dishes at one time, or those who have the habit of lunch, it is suggested that overnight dishes should be packaged separately first, so as not to let chopsticks come into contact with saliva or other substances, which can reduce the probability of microbial contamination of overnight dishes. If microorganisms do not participate in the decomposition of overnight vegetables, nitrate production can be reduced and microbial growth can be avoided.