Must I not eat overnight dishes?
In this era when health knowledge is flying all over the sky, many people are actively or passively absorbing health knowledge, which has both advantages and disadvantages. Fortunately, people pay more attention to health than they did decades ago. This is a kind of progress in concept, which is the product of social development to a certain stage. That is to say, only when people have no worries about food and clothing can they focus on higher-level things such as maintaining health, otherwise they can only pay attention to food and clothing. The downside is that when all kinds of health-related knowledge appear in front of your eyes, you may not be able to tell whether it is correct with a professional eye. This may be misleading and even dangerous. Therefore, the knowledge we get from non-professionals or institutions is for reference only. Many people have heard that "you can't eat overnight dishes", so from a professional perspective, can you eat overnight dishes? To answer this question, we must know what happened to the overnight dish. Most plants contain nitrate, which is converted into nitrite by some enzymes in plants. Bacteria in the environment will also reduce nitrate in plants to nitrite, which will be converted into nitrosamines in human body. Nitrosamines are recognized as one of carcinogens.
As we all know, the activity of enzymes needs a certain temperature, and when vegetables are cooked, the enzymes in vegetables will lose their activity. At this time, enzymes in vegetables will no longer be able to convert nitrate into nitrite, and then bacteria will play a role. It takes some time for bacteria to reproduce. When it reaches a certain amount, it may produce a considerable amount of nitrite, which should be the root cause of the so-called "overnight dish", but we can also see that the problem is not that it is not overnight. It's time. Time is the key. Cooking in the evening/kloc-after 0/0,/kloc-after 0/2 is overnight. Would you say you can't eat? Or 1 in the morning, and 1 1 in the evening is the dish of the day. If you rigidly believe that the food of the day is all right, will you feel comfortable?
It can be seen that the problem lies in time, not overnight interval. Of course, this should also take into account the ambient temperature. The environmental temperature of the same pot of vegetables is different, and the number of bacteria reproduction at the same time may be different. Generally speaking, low temperature can inhibit bacterial reproduction. In this case, it is of little significance to simply consider whether this dish is overnight, because in natural environment, the temperature is high in summer and low in winter, and the summer dish may have deteriorated before overnight, while the winter dish may have been separated. Overnight dishes are not suitable for eating.
It is said that the low incidence of gastric cancer is related to the habit of not eating overnight dishes. Because some green leafy vegetables contain more nitrate, if they are left for too long after cooking, nitrate will be reduced to nitrite under the decomposition of bacteria, which is carcinogenic and cannot be removed by heating.
1. Healthy eating
Usually, the nitrate content of stem and leaf vegetables is the highest, melon vegetables are slightly lower, and roots and cauliflower 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, try to make fewer stem and leaf vegetables and choose melons.
2. Pay attention to the storage of overnight soup
Many people like to cook soup, and cook it in the refrigerator before drinking it the next day. Is this overnight soup good for your health?
Healthy diet: The best way to preserve the soup base is not to put seasonings such as salt. After the soup is cooked, scoop out what you want to drink that day with a clean spoon, and it is best to store it in the refrigerator with a clay pot. Because the leftover soup is stored in aluminum pot and stainless steel pot for a long time, it is prone to chemical reaction, so it should be kept in glass or ceramic utensils.
3. Bring your own lunch.
Many people are tired of eating box lunch in restaurants and don't want to fight guerrilla warfare outside, so they choose to bring their own lunch. However, most of the meals we brought with us were from the night before. After a night and a morning of storage, the loss of nutrients in food is more serious, so when you bring your own food, you should also choose.
You can bring your own rice, beef, bean products, all kinds of non-green vegetables, fruits, yogurt and other foods.
To ensure enough energy for lunch, foods containing protein, vitamins and minerals are essential. Among vegetables, towel gourd and lotus root contain more cellulose. In addition, you can also choose celery, mushrooms, radishes and so on. When cooking, just fry the vegetables for six or seven minutes to prevent further damage to their nutrients when microwave heating the next day. Try to choose meat dishes with less fat, such as beef and chicken. After cooking, cover it immediately after cooling and store it in the refrigerator at 4℃. Take it to the office the next day and put it in the refrigerator immediately. At lunch, fully heat it in the microwave oven and eat it.
Overnight foods that are not suitable for eating include fish, seafood, green leafy vegetables and cold salad. According to the Evening News, green leafy vegetables such as green vegetables and spinach are repeatedly cooked and fried each time, and the carcinogens in them increase by dozens of times, which is extremely carcinogenic ... "International Symposium on Early Gastric Cancer between China and Japan" was held in Shanghai. According to experts, China has the highest incidence and mortality of gastric cancer. Half of the patients with early gastric cancer are asymptomatic, and the diagnosis rate is below 5%. "19 In the 1930s and 1960s, gastric cancer was also a high-incidence tumor in Japan, but with the popularity of refrigerators, people began to get used to eating it on the same day. Since the 1970s, the incidence of gastric cancer in Japan has dropped significantly. " Experts say that the high incidence of gastric cancer is related to improper eating habits, such as eating overnight dishes and returning to the pot. Experts said: "Green leafy vegetables such as vegetables, spinach, green beans such as kidney beans, (bean workers) beans and broad beans are repeatedly returned to the pot, and chlorophyll is prone to chemical reactions, producing degradable components, which is easy to cause cancer. Seafood such as crab, fish and shrimp can easily produce protein degradation products overnight, which will damage liver and kidney functions. The leftover soup is stored in aluminum pot and stainless steel pot for a long time, and it is also prone to chemical reaction, so it should be kept in glass or ceramic utensils. In addition, the refrigerator is not a fresh-keeping box, and fresh vegetables and fruits are easy to breed bacteria. As for pickled foods such as pickles, salted fish, ham, sausages and pickles, it is not advisable to eat more because of the carcinogen ammonium nitrite. " Experts remind the public that the daily diet should be light and fresh, do not eat overnight dishes, and eat more fresh pork and braised pork. Leftovers should not be stored for more than 12 hours, and water should not be boiled repeatedly. If the public finds that the upper abdomen often has discomfort such as fullness and pain, and gastritis and ulcers do not heal repeatedly, they should be admitted to the hospital in time. Regular gastroscopy is recommended for high-risk groups with family history over 40 years old.
Eggs cannot be eaten overnight.
Because if the egg is not fully cooked, the immature yolk will be eaten overnight. Nutritious things can easily breed bacteria if they are not properly preserved, which is harmful to the body, such as gastrointestinal discomfort and flatulence. However, if the food (eggs) is cooked and properly sealed at low temperature (usually refrigeration temperature), it can generally be preserved for 48 hours. From the tips of scientists, we can know whether eggs can be eaten overnight depends not only on whether they are heated, but also on whether they are cooked for the first time. Only after the first boiled egg is cooked, it is no problem to cook it overnight. This is also the truth of tea eggs. Maybe you don't know that tea eggs are boiled twice, the first time is boiled, the second time is to break the egg skin, add tea and other accessories, and then cook.
You can't drink overnight tea.
After staying overnight for a long time, most of the vitamins are lost, and the protein and sugar in the tea soup will become nutrients for bacteria and mold. So people usually think that overnight tea can't be drunk.
It is wrong to say that boiled water cannot be drunk overnight.
In fact, the content of nitrite in water is very low, and it will generally be oxidized into nitrate, so this statement is unfounded. In fact, boiling water is a good habit of China people, which can greatly protect health, play a good disinfection role and kill pathogenic microorganisms. Therefore, boiled water is necessary for China, especially when the safety of drinking water is not particularly good. Bottled water will be contaminated by microorganisms if it is opened for a long time, which may lead to diarrhea, but it will not cause cancer. The statement that nitrosamines are produced is groundless.
Can tremella be eaten overnight?
Auricularia auricula soup is an advanced nutritional supplement, but after a night, the nutritional components will be reduced and harmful components will be produced. Because both the tremella cultivated indoors and the tremella cultivated in the wild of basswood contain more nitrate, if cooked for a long time, the nitrate will be reduced to nitrite under the decomposition of bacteria. When people drink this soup, nitrous acid naturally enters the blood circulation. Red blood cells in the blood contain hemoglobin, which can carry a lot of oxygen for the body's needs. Nitrite, on the other hand, oxidizes normal hemoglobin into methemoglobin, losing its oxygen-carrying ability, leading to the lack of normal hematopoietic function in human body.
Seafood can't stay overnight.
Overnight foods that are not suitable for eating include fish, seafood, green leafy vegetables and cold salad.
Fish and seafood can easily produce protein degradation products overnight, which will damage liver and kidney function. Green leafy vegetables contain different amounts of nitrate. If it is overcooked or left for too long, not only will vegetables turn yellow and taste bad, but nitrate will also be reduced to toxic nitrite by bacteria, which will cause cancer. Cold salad is polluted when it is processed. Even if it is refrigerated, it may have gone bad after a night, so it should be cooked and eaten now.
Don't eat bad home cooking overnight.
Pot-stewed and rotten vegetables are both popular seasonal dishes in Shanghai. Many citizens also like to put the leftover stewed and spoiled food in the refrigerator for the night, but this practice has great food safety hazards. To prevent food poisoning, don't eat inferior goods braised overnight in spring and summer. Bulk braised pork should be eaten on the same day, not overnight. From the perspective of food safety, this is unsanitary. If possible, it is best not to eat bad goods overnight. Food experts warn that even the food in the refrigerator is not absolutely "safe". Refrigerators are prone to mold and psychrophilic bacteria.