Thrift is the traditional virtue of the Chinese nation, so many people always like to put the leftovers in the fridge, waiting for the next day to eat, but many people also say that eating overnight food for a long time is easy to cause cancer, so will you eat the overnight food?
Can long-term eat overnight dish carcinogenic?
In fact, generally not, but the vegetables they eat will have nitrite substances overnight. When storing vegetables, we should pay attention to many problems.
From the point of view of food science, it's not a problem to stay up all night. The essence of the problem is what happened to the preserved dishes. The worry is that the process of transforming nitrate into nitrite in vegetables has nothing to do with overnight, only with preservation conditions.
Finally, how much nitrite will be produced in the vegetables depends on the vegetables themselves, the conditions under which the cooked vegetables are preserved, and the time for preservation. Overnight dishes generally refer to the dishes that have been kept for more than 12 hours.
The content of nitrite is about 7 mg / kg when vegetables are put in refrigerator for 24 hours. There is no clear standard for the nitrite content of processed vegetables in China, so what level is the content of 7Mg / kg? Let's find a reference: according to the national regulations, the nitrite residue in pickles should not exceed 20mg / kg, the overnight vegetables are much healthier.
Compared with more complex vegetables, meat is much simpler and rougher. If there is no artificial processing, they are very low in nitrite, so there is no need to worry about the impact on health overnight.
Whether the overnight food can be eaten or not, but we should pay attention to many problems. Vegetables and meat should be kept in a relatively clean place.
Reduce the storage time of vegetables, especially green leaf vegetables, and increase the frequency of buying vegetables. Secondly, the vegetables that need to be preserved can be cleaned and wrapped to reduce the bacteria carried. Do not finish cooked vegetables, can also be sealed in the refrigerator.
&Lsquo; overnight & rsquo; is not the key to the production of nitrite, and heating will not increase the content of carcinogens. Of course, many kinds of vitamins in vegetables will be destroyed when they are heated, and the vegetables heated for many times will also be difficult to eat. From the perspective of & lsquo; delicious & rsquo;, the & lsquo; overnight Food & rsquo; is really poor; from the perspective of nutrition, multiple heating does have a certain impact; from the perspective of safety, there is no problem in heating.
Precautions for eating overnight food
1. Food that cannot be eaten should be stored at room temperature for no more than two hours.
2. It's better to split the leftovers. Put a large amount of food in a large container, and the food will be cooled for a long time, which will increase the risk of bacterial growth. It is better to divide the food into several parts and put them in shallow containers to speed up the heat dissipation of the food.
3. Cooked food and raw food must be strictly separated. Because the refrigerator space is limited, many people will put fresh vegetables and other raw food directly next to cooked food, which is easy to cause cross infection of bacteria. Cooked food should not be stored in the refrigerator for more than 3 days at most. If it is suspected that the food has gone bad, it should be discarded as soon as possible.
4. When taking out, heat to at least 75 ℃. The food stored at 0 ℃ ~ 4 ℃ shall be heated to 75 ℃ at least after taken out from the refrigerator, and the food with more water shall be boiled to the boiling point.