Things can't be absolute! Leftovers can be eaten. If all the leftovers are thrown away, isn't that a waste? ! ! \ x0d \ x0d \ But we should not blindly eat leftovers, but also pay attention to health, especially in summer. \x0d\\x0d\ Let's talk specifically about the leftovers: \x0d\\x0d\ The preservation time of leftovers is appropriate without meals, and it is better to eat at noon in the morning and at night in the afternoon, and try to solve it within 5-6 hours, and it is best not to eat overnight dishes. \ x0d \ x0d \ According to scientific determination, some overnight vegetables, especially overnight green leafy vegetables, not only have low nutritional value, but also produce pathogenic nitrite. The amount of nitrite produced in stored vegetables increases with the increase of storage time and temperature, but if vegetables are stored in refrigerator (2-6 degrees Celsius), the increase of nitrite is less. \ x0d \ x0d \ If it is in winter, some families think that it is cold and leftovers don't need to be put in the refrigerator. This view is also wrong. Now, the widespread use of refrigerators in cities has reduced the nitrite content people consume from food, but it does not mean that putting vegetables in the refrigerator can be completely reassuring; After a long time, the nitrite content will still increase. \ x0d \ x0d \ It is worth mentioning that under the same storage conditions, different kinds of vegetables produce different amounts of nitrite. Usually, stem and leaf vegetables are the highest, melon vegetables are slightly lower, and roots and cauliflowers are in the middle. Therefore, if you buy different kinds of vegetables at the same time, you should eat stems and leaves first, such as Chinese cabbage and spinach. If you are going to cook more vegetables and eat them hot the next day, you should try to make fewer stem and leaf vegetables and choose melon vegetables. \ x0d \ x0d \ There is oil and salt in the fried vegetables. After one night, the vitamins in the vegetables are oxidized, which greatly increases the content of nitrite and turns into nitrite after entering the stomach. Although nitrate is not a direct carcinogen, it is a big health hazard. After 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 in hot weather, overnight meals are contaminated by bacteria, which will multiply and easily lead to gastroenteritis and food poisoning. \ x0d \ x0d \ fried vegetables, many of which can't be eaten and stored, especially some leftovers with high protein and fat, are not allowed to eat. Harmful bacteria in the air will attach to the leftovers within 2 hours and start to reproduce. As we all know, most of protein and fat will produce harmful substances under the action of bacteria, such as hydrogen sulfide, amines, phenol, etc., which are harmful to human body. \ x0d \ x0d \ It is an indisputable fact that eating leftovers for a long time is easy to cause cancer. Therefore, you can't eat overnight dishes. When cooking, the best way is to tailor your clothes, not to harm your health! \ x0d \ x0d \ thank you! !