In the "family group", overnight is a terrible thing.
They often say: overnight water, overnight tea, overnight dishes, overnight watermelon are all carcinogenic...
Is overnight food really not eaten?
Don't be scary!
This is the only one that can be toxic (the acute subpack can be pulled directly to Part 2).
1. Drink water overnight
The truth:
Overnight water does contain nitrites, but talking about toxicity without dose is tantamount to playing hooliganism.
In the mainland drinking water sanitation standard, the nitrite content is specified as ≤1 mg/L [1]. The study found that after 3 days of bottled water, purified water, and tap water, nitrite was still within the safe range [2] and could be safely drunk.
Drink overnight water and really remember: cover the lid.
2. Overnight tea can be drunk
The truth:
Just said that talking about toxicity out of dose is equivalent to playing hooliganism.
According to the experimental test of Beijing Nutrition Source Research Institute [4], whether it is Pu'er tea, chrysanthemum tea, or Longjing, after 12 hours and 24 hours, the nitrite content is within the safe range and will not cause cancer.
Image source: Stand Cool Helo
The reason why overnight tea will change color is because the polyphenols inside are oxidized, and the tannic acid increases after a long time, the taste is worse, but it will not endanger health.
3. Putting overnight dishes in the refrigerator is not a big problem
The truth:
Zhejiang Ningbo Food Inspection Institute has tested 30 home-cooked dishes[5] and found:
All kinds of dishes stored at 4 °C (simulating the refrigerator environment), the nitrite content after 24 hours and the time when it first came out of the pot did not change much, less than 1/3 of the national nitrite limit value [6], can be eaten.
At 25 ° C (simulated room temperature), the meat dish is fine overnight, but the nitrite of the leafy vegetable will increase significantly, and it is best to eat it within 6 hours.
(Image source: soogif)
So it is not that overnight dishes can not be eaten, but remember to put the refrigerator, it is best to leave no meat leftovers, cold dishes do not stay.
In addition, the second meal of the overnight dish must be fully heated (heated at 100 ° C for more than 3 minutes), it is best to add some green onions, ginger and garlic, seasoning and sterilization.
4. Overnight watermelon refrigeration is no problem
The truth:
Most of the watermelon harm incidents that have occurred in the news are caused by the knife that cuts the watermelon and the preservation environment are not clean enough, and the pathogenic bacteria multiply in the watermelon.
Researchers at the Fujian Academy of Agricultural Sciences have done a special experiment, 3 kinds of watermelon cut open and covered with plastic wrap, put in the refrigerator (4 ° C) for 16 hours [7], the results found that the total number of colonies of overnight watermelon and fresh watermelon is similar, which can be safely eaten.
If you want to eat more assured, it is best to wash the knife, watermelon, hand, and board before cutting watermelon. Before refrigerating, cover with breathable plastic wrap.
Foam fungus, white fungus and fermented rice noodles and starch products are easily contaminated by Pseudomonas cocos, which produces high-temperature resistant rice yeast acid toxins at room temperature.
People who eat it will not only have abdominal pain, bloating, diarrhea, nausea and vomiting, but also excessive intake can lead to multi-organ failure and even death in the human body!
(Image source: Internet)
It was initially identified as the culprit in the previous Heilongjiang acid soup poisoning incident (which resulted in the death of 9 people).
Soak your own fungus and white fungus, and generally soak it in cold water for 1 to 2 hours before you can process it.
It is too late to be better than 4 hours, with hot water to soak in the time is even shorter, if the mucus, the surface is sticky, smelly, it is best to throw it away.
Of course, there is another one that cannot be asked for:
Overnight feud.
Long anger hurts the body!
Finally, I send you four sentences of "Mo Qi":
Others are angry with me,
There is no one to replace the disease.
If I am angry with anyone who wishes,
Moreover, it hurts and is laborious.
Special Author: Huang Yuanyuan
Registered Dietitian
Review expert: Zuo Xiaoxia
Director of the Nutrition Department of the Eighth Medical Center of the PLA General Hospital
bibliography
[1] GB5749-2006, Sanitary Standard for Drinking Water.
Chen Ying,Xiao Yanjie,Liu Xiaolin. Changes in nitrite and nitrate content at different times after drinking water is boiled[J]. Journal of Jinzhou Medical University, 2018, Vol. 39, No. 6.
Qin Pinzhang. Several Opinions on Modifying the Sanitary Standards for the Use of Nitrates and Nitrites for Food Additives[J], Chinese Journal of Preventive Medicine, 2005, 6: 150-151.
[4] Overnight tea is as poisonous as a snake? CCTV Experiments Are Still Innocent[J], China Tea, 2014, 36(06): 23.
[5] http://py.zjol.com.cn/rdgz/201907/t20190724_10651911.shtml Zhejiang Online, "Overnight Vegetables Are Toxic? Ningbo Food Inspection Institute uses 450 data to tell you the answer".
[6] GB 2762-2005, Limits of contaminants in food.
Lü Xin,Chen Lihua,Li Xiaolin,Liu Lanying,Huang Wei,Li Yueren. Evaluation of edible safety of fresh-cut watermelon after overnight refrigeration[J].Fujian Journal of Agricultural Sciences,2018,33(08):865-869.
Editors: Zhao Yanan, Guo Qian, Zhang Liang
*The content of this article is a popularization of health knowledge and cannot be used as a specific diagnosis and treatment recommendation, nor is it a substitute for face-to-face consultation by a practicing physician, for reference only.
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