I don't know when I started, everyone began to fear the "overnight" food, and thought that the food that was placed overnight would produce all kinds of harmful substances and harm the body. There is often such a voice on the Internet that the overnight dishes cannot be eaten, the overnight water can't be drunk, and the overnight tea can't be drunk. Isn't the science unscientific?
Why do you say that you can't eat food overnight?
The reason why the food cannot be eaten overnight is because it contains more nitrites. "Some green leafy vegetables contain more nitrates. If they are left for too long after cooking, the nitrate will be reduced to nitrite under the decomposition of bacteria. Nitrite has carcinogenic effects and heating. Can't be removed."
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What is nitrite?
Everyday we drink water and food, there is a certain amount of nitrite, nitrite itself is not carcinogenic. When nitrite enters the body, it will form nitrosamines after decomposition with proteins. It is a truly terrible carcinogen.
In most cases, the nitrite that enters the body through diet is within the normal range and will be excreted as normal with the urine.
How much nitrite is contained in the overnight dish?
China's health standards stipulate that the residual amount of nitrite should not exceed 30mg/kg in meat products and 20mg/kg in pickles. According to the experiment, normal green vegetables were placed in a refrigerator at 4 ° C, and the nitrite was only increased from 3 mg/kg to 7 mg/kg after 24 hours. If the dish is turned over, it will cause the bacteria to spread. The nitrite in the leftovers will be slightly higher, but it is still very low and will not pose a threat to the human body. However, it should be noted that the leftovers should be placed in the refrigerator in time, and must be heated when heated the next day to avoid bacteria.
Does overnight tea also contain carcinogens?
According to our national regulations, the safety standard for nitrous acid in drinking water is 1ug/ml. In other words, as long as the nitrate does not exceed this amount, it can be normally metabolized by our body and will not cause harm to health. After testing, a cup of black tea or green tea, after standing for 24 weeks from brewing, the nitrous acid content increased to more than 2 times the original concentration, but the dose was only 0.130ug/ml. The amount of poisoning is still very far.
Can you drink water overnight?
It is rumored that these waters have a lot of nitrates. Drinking them can cause poisoning, serious loss of consciousness and death, and nitrite is also carcinogenic.
Long-term, long-boiling, repeated distillation can make some of the nitrate in the water turn into nitrite, but the nitrate content in the water itself is very low, boiling can not make the nitrate increase, can be converted into nitrite There are even fewer.
As for the nitrite carcinogenicity in water, it is a bit exaggerated. Nitrite itself is not carcinogenic. It is converted to nitrosamines to cause cancer. Transformation requires many preconditions, not boiling water.
Xi'an Healthway Biotech Co.,Ltd , https://www.xianhealthway.com