Can eating overnight dishes cause cancer? How long can it last? Understand the hazards, heating and preservation methods at once

How long can overnight dishes be kept? As the New Year is approaching, many people will prepare tables and fry the food they can’t finish, and finally put the endless vegetables into the refrigerator and heat them up the next day. What harm will overnight dishes bring? Is it true that the shop tells that hot-dirty vegetables can cause cancer? How long can overnight dishes last? This article organizes common QA for overnight dishes and methods for heating overnight dishes at one time.

Can eating overnight dishes cause cancer?

Is eating too much overnight dishes in the shop causing cancer? Since the planting of vegetables requires fertilizer, there may be salt nitrate residue, especially green leaves vegetables with high residual content. If the subsequent storage method is inappropriate, salt nitrate, combined with the amine-containing foods, may form carcinogenic substances of — "Animalamine".

However, based on the diet frequency and intake of ordinary people, the content of nitrosamine in overnight dishes will not harm humans. Yang Zhenchang, director of the Department of Clinical Toxicants and Professional Medicine of Taipei Rong, said that although vegetables are not properly stored, it is possible that salt nitric acid will be produced due to bacterial growth, but the chance is very low. Moreover, most people usually heat up before eating overnight dishes, and high temperature also has a bacteria-killing effect.

In addition, Zhang Xuanyun, a nutritionist at the Renaissance Hospital of Taipei City, pointed out that although the leaves contain yaki salt nitric acid, there are currently no sufficient research evidence to increase the carcinogenic rate. Moreover, the leaves can be washed off the surface yaki salt nitric acid when cleaning vegetables. In addition, the leaves are rich in phytochemicals, vitamins C, E and other antioxidants, so there is no need to worry too much about the carcinogenic problem of yaki salt nitric acid.

The dangers of overnight dishes! Pay attention to refrigeration and heating temperature

From the above, we can see that the salt nitric acid content in overnight dishes is very low. Xu Jiesong, a nutritionist at Fengyuan Hospital of the Ministry of Health and Welfare, reminded that the public should not overly worry about overnight dishes causing cancer. Instead, they should pay attention to the refrigeration temperature of overnight dishes. If the storage temperature is not low, it may cause microbial infection, thereby increasing the risk of gastritis.

Xu Shengsong further explains that taking eggs as an example, eggs are of high-quality protein. If you can't finish the cooked eggs, you should be kept in a refrigerator below 7℃ as soon as possible. Before eating, heat them up to above 70℃. Pay attention to any odor or changes in quality when eating. Half-cooked eggs are prone to breeding bacteria. It is recommended to eat them after meals, and it is not advisable to eat them separately.

As for many people, they will put the dishes in the refrigerator before refrigerating. Zhang Xuanyun reminds that 7~60℃ is a dangerous temperature belt, and most bacteria can grow and reproduce quickly in this temperature area. It is recommended to put it slightly to the temperature that does not burn your hands and put it in the refrigerator within an hour. Then seal it and refrigerate it in the refrigerator. It can quickly reduce the temperature below 7℃ to effectively inhibit the growth of bacteria. In addition, putting the food in the electric pot to keep the temperature in the oven is actually not correct. The temperature of the temperature is usually lower than 60℃, which will also cause bacteria to grow. It is recommended to refrigerate as quickly as possible to avoid food quality.

How long can overnight dishes be kept? Will repeated heating be uninvestable?

Refrigeration in the refrigerator can only inhibit bacteria and cannot kill bacteria. It is recommended that the refrigerated overnight dishes should be eaten within 2 to 3 days. It is recommended that the refrigerated overnight dishes be eaten within 7 to 10 days. If there is any change in quality or strange taste, it should not be eaten again. Moreover, vegetables will easily change color and taste will be worse after being heated. They will usually not be left for the next meal. It is recommended to cook some fresh vegetables during overnight meals to ensure balanced nutrition.

As for, will repeated heat overnight dishes cause nutritional loss? Nutritionist Li Wanping said that if compared with current cooking, foods that are heated again will definitely cause water-soluble vitamins such as B and C to lose nutrients, but sugars, fat, protein, as well as fat-soluble nutrients such as vitamins A, D, E, and K, will not disappear due to heat.

5 precautions for preserving and handling overnight dishes

Toxicology expert Zhao Mingwei said that it is not recommended to heat leftovers repeatedly, because to ensure that bacteria and toxins are killed, the heating temperature must be above 100 degrees Celsius. Moreover, after the bacteria in overnight dishes grow, there will be "endotoxins" problems. To destroy the endotoxins, the heating temperature may be above 160, and it cannot be eliminated by general heating methods such as microwave, boiling, and steaming. The following are 5 points to note when preserving and treating overnight dishes:

1. The food should be cooked, and the overnight dishes should be fully heated: Nutritionist Fang Ci said that, especially other proteins in non-beef, should be cooked to avoid bacterial growth or food poisoning.

2. Use public chopsticks: Avoid the vegetables getting drooled, as it is easy to breed bacteria if they are stored for a long time when they are drooled.

3. When food is divided, only the amount of hot meals will be refrigerated: Many people will cook a large pot of hot meat and curry. It is recommended to refrigerate the food first. During the next meal, only the amount you can eat during that meal will be heated.

4. Seafood does not leave behind meals: Seafood is easy to breed bacteria. It is not recommended to keep the next meal and continue to eat. Pay attention to the nutritional combination of the meal.

5. Saving container selection: Zhang Xuanjun pointed out that overnight dishes should be stored in glass and stainless steel containers, and should be cleaned thoroughly. If there are scratches on the container or plastic cover, it may cause dirt to be stagnated and should be replaced immediately, and attention should be paid to clean the silicone strips on the inner side to avoid bacteria and bacteria from growing and contaminating food.