It is best not to eat overnight meals in winter.

According to scientific measurements, some overnight vegetables, especially overnight green leafy vegetables, not only have low nutritional value, but also produce disease-causing nitrites. The amount of nitrite produced in stored vegetables increases as the storage time increases and the temperature increases. However, if the vegetables are refrigerated in the refrigerator (2-6 degrees Celsius), the increase in nitrite will be less.

It is winter, and some families think that the weather is cold and there is no need to put leftovers in the refrigerator. This view is also wrong. Nowadays, the widespread use of refrigerators in cities has reduced the nitrite content that people ingest from food, but this does not mean that they can safely put vegetables in the refrigerator; over time, the nitrite content will still increase. . It is worth mentioning that the amount of nitrite produced by different types of vegetables under the same storage conditions is inconsistent. Generally, stem and leaf vegetables are the highest, melons are slightly lower, and roots and cauliflowers are in the middle. Therefore, if you buy different types of vegetables at the same time, you should eat stems and leaves first, such as Chinese cabbage, spinach, etc. If you plan to cook more dishes to eat hot the next day, you should try to cook less stem and leaf vegetables and choose melon vegetables.

There is oil and salt in the fried vegetables. After overnight, the vitamins in the vegetables are oxidized, which greatly increases the nitrite content. After entering the stomach, it turns into nitrite. Although nitrate It is not a direct carcinogen, but it is a major health hazard. After nitrite enters the stomach, it will generate a substance called NC (N-nitroso compound) under certain conditions, which is one of the risk factors for inducing gastric cancer. Especially when the weather is hot, the overnight meals are contaminated by bacteria and will multiply in large quantities, which can easily cause gastroenteritis and food poisoning.

Many fried dishes cannot be finished and stored, especially some high-protein and high-fat leftovers, which cannot be eaten. Harmful bacteria in the air will attach to leftovers and start to multiply within 2 hours. Everyone knows that under the action of bacteria, most proteins and fats will produce harmful substances, such as hydrogen sulfide, amines, phenols, etc., which are harmful to food. Harmful to human body. It is an indisputable fact that eating leftovers for a long time can easily cause cancer. Therefore, you cannot eat dishes that have been cooked overnight. When cooking, the best way is to tailor the dishes accordingly without harming your health.