It is said that "saving is the traditional virtue of the Chinese nation", but in the face of the leftovers and leftovers in the family, many people have made difficulties in their hearts: it is a pity that it is a pity;Nitrite exceeds the standards "" carcinogenic "and" poisoning ", which makes people worry …
Can I still eat overnight?Which dishes should not hesitate to pour, which can be left to the next meal?How should we scientifically handle overnight dishes?Today, I will answer them one by one.
1 overnight dish contains nitrite
Toxic and carcinogenic?
First of all, we need to be clear: the so -called "overnight dishes" are not just to eat the rest of the day and put them in the next day.In terms of science, the dishes with more than 8-10 hours of placement are overnight dishes.
The longer the food is placed, the increase in the nitrite content in it will increase.Many people are always worried that eating will cause nitrite poisoning and even cause cancer.Is this really the case?
· Nitrite itself is not carcinogenic
In fact, nitrite itself is not carcinogenic.It exists in the environment of nature, especially in food, such as: the average content of nitrite in vegetables is about 4mg/kg, the meat is about 3mg/kg, and the eggs are about 5mg/kg.After being picked and harvested, vegetables and fruits will continue to produce nitrite.
In addition, nitrite is also a food preservative that can be legally used. As long as it is within the scope of national food safety standards, there is no health risk.For example: In our lives, ham, bacon and other pickled foods may be added with nitrite.
· Under certain conditions, nitrite is poisonous
However, everyone always said that overnight dishes are toxic, carcinogenic, and not exactly the wind:
On the one hand, if you consume excessive amounts of nitrite in the short term, it will cause acute poisoning, affect the operation of red blood cells, and make blood from transporting oxygen.There may be symptoms such as dizziness, shortness of breath, shortness of breath, nausea, vomiting, abdominal pain, diarrhea, and lips and fingertips into blue; seriously may cause hypoxia in the brain and even death.
On the other hand, nitrite will react with the eaten protein after entering the acidic environment of the stomach to produce a nitrosamines that really have carcinogenic effects.Long -term consumption may cause cell mutations, and even induce a variety of cancers such as gastric cancer, esophageal cancer, liver cancer, colon cancer.
· Is the nitrite in the overnight dish exceeded the standard?
According to relevant domestic research reports, the minimum poisoning dose for the population is about 300mg-500mg, and intake of 1-3g can cause death.
What is the concept?Generally, overnight dishes are stored in the refrigerator refrigerator (not pickled vegetables and processing meat), the nitrite content will not exceed 10 mg/kg.
Therefore, the nitrite content in overnight dishes is far from the dose of poisoning. Occasionally, there is not much problem. There is no need to "talk about the change of overnight dishes". The focus is on the frequency and amount of eating.
2 These 4 kinds of overnight dishes are too dangerous
It is best to pour it out after eating!
So, can overnight dishes be eaten with peace of mind?no!
This is because overnight meals are stored in storage and secondary heating, which will not only cause damage and loss of some nutrients, but also easily breed bacteria. After consumption, it is easy to cause gastrointestinal discomfort or even food poisoning.Especially the following 4 kinds of overnight dishes, the hidden harm to the body is greater, it is best to pour it out:
· Overnight vegetables
There are many benefits to eating vegetables. According to the "Dietary Guidelines of Chinese Residents", adults should eat 300 ~ 500 grams of vegetables every day.But there is an old saying good: "Ning left, not left."
If the vegetables are cooked for a long time or improper storage, a large number of nitrite is produced under the decomposition of nitrifying bacteria, so that the content of the remaining vegetables is likely to reach the severe limit.
Zhejiang Ningbo Food Inspection Institute had done an experiment and found green leafy vegetables such as celery and spinach. After frying, it was stored at a normal temperature environment of 25 ° C. After 24 hours, the nitrite content reached an amazing 100mg/kg above 100mg/kg.Essence
It is strongly recommended that green leaf vegetables should not be eaten after overnight.
· Overnight seafood
Seafood products such as shrimp and crabs, it is difficult to ensure that the general cooking and eating methods are difficult to completely eliminate the various bacteria that may exist in the seafood itself.corruption!
If you do n’t eat it overnight on the same day, it may cause bacteria to reproduce and produce bacterial toxins, causing damage to liver and kidney function.
· Tremella mushrooms overnight
Many people stew a pot of white fungus soup in the refrigerator and eat several times.But this approach is actually very dangerous!
Generally speaking, dry white fungus and mushrooms, whether indoor cultivation or field collection, the content of nitrite is lower than that of vegetables.However, if the room temperature is soaked for a long time, or it has been putting for a long time after cooking, it will not only increase the production of nitrosamines after consumption, but also it is easier to breed bacteria.After eating, symptoms such as abdominal pain, diarrhea.
[Tips]: Tremella soup is sealed and refrigerated for 1-2 days in the refrigerator; but more than 3 days, it is best not to drink it; and the remaining Tremella in the bowl, if there is no refrigerated storage, the second second, secondIt’s best not to eat it.
· "Heart Egg" overnight
Many people love to eat the "heart eggs" for half a lifetime than cooked white boiled eggs.However, this semi -cooked egg sterilization may contain a variety of pathogenic bacteria such as Salmonella; it is more likely to breed bacteria for a long time, and it will harm the intestine after consumption.
[Tips]: If the egg is cooked for the first time, and stored in low temperature and sealing, in this case, it is generally not a big problem to eat overnight.
3 Storage of leftovers and leftovers scientific
Eat more at ease
Generally speaking, how much meals are eaten and how much do, they really do too much, they ca n’t finish, there are left, and the rest can be processed according to the following 4 points:
· Ning leftover amaranth, no vegetarian dishes
When a meal is destined to leave vegetables, the vegetables should be eaten priority, and those who ca n’t eat meat can be left to the next meal.
For details, please refer to the following storage time rankings:
Green leafy vegetables: 0 days of preservation (cold vegetables should be eaten as soon as possible);
Stadium: 1 to 2 days of preservation time;
Livestock and poultry meat: The preservation time does not exceed 3 days.
· Don’t wait until it is completely cold and then put it
The longer the leftovers and leftover dishes are placed at room temperature, the greater the risk of bacteria breeding; and some of the toxins produced by some bacteria may not be killed through normal family cooking.
Therefore, when the dishes are so cold that the temperature is not hot, you can use the fresh -keeping box to pack the refrigerator, don’t wait until it is completely cold.
· Put the leftovers in the refrigerator, and the location is also critical
① The upper layer of the refrigerated area: you can put the leftovers and other cooked food;
② In the middle of the refrigerated area: suitable for putting fruits and vegetables;
③ The lowest temperature refrigerator area at the bottom layer: you can put eggs, dairy products, soy products, and meat you want to eat that day.
In this way, the ripening is separated, and some parasites and bacteria that are carried in raw food can be dropped on the risk of cross -infection when they are taken on the cooked food such as leftovers.
· Heat completely before eating
The leftovers must be completely heated before eating, especially the meat.The thorough heating refers to the overall heating of the dishes to 100 ° C and keeping boiling for more than 3 minutes.
In order to avoid uneven heating, you can use tools such as chopsticks, forks, etc. to see the inside of the food, and determine that the inside is hot and out of the pot.
Source: Central Radio and Television Terminal CCTV