So, you can imagine my anger when I heard that someone publicized the dangers of overnight meals.
Harm of online overnight meals
These remarks can be roughly divided into three categories.
The first category is not reliable at all.
Protein in fish and protein in seafood are composed of amino acids. As long as these amino acids are harmless to people, their normal degradation products will not harm people.
Under the growth and metabolism of some microorganisms, protein, amino acids and other nitrogen-containing substances in fish can be decomposed into nitrogen, trimethylamine, histidine, indole, sulfide, alcohol, organic acids and other products, which may be harmful to human body, which is called corruption. However, on the one hand, the shape, color, smell and taste of fish and seafood will change after spoilage, which is easy to identify. On the other hand, corruption takes a long time, so there is no need to worry about it every other night. [ 1]
? Is the lo mei itself unsanitary? This statement is very controversial. If stew is unsanitary, don't eat it; If it is sanitary, just pay attention to the storage method and storage time, set the refrigerator temperature reasonably, clean the refrigerator regularly, and put it in the refrigerator for one or two nights.
The color of tea darkens overnight because the tea polyphenols contained in it gradually form yellow, red and reddish-brown oxidation products after oxidation. Although in this process, the color becomes worse, the clarity decreases, and the nutrients are lost, it will not produce substances that are toxic to human body. [2]
Next, there is some truth, but it is distorted.
Plants need nitrogen for growth. For vegetables, it is mainly nitrate nitrogen. After entering plants in large quantities, it will become nitrate after several physiological processes. [3]
Under normal circumstances, nitrate is harmless to human body. However, nitrate may be converted into nitrite by nitrate reductase. When nitrite enters the human body, it will not only cause methemoglobin, but also combine with amines in the human stomach to produce nitrosamines, which can induce cancer in the digestive system, thus causing serious harm to human health.
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According to scholars' research, different treatment methods will have different effects on the same vegetable in the same place. The lower the storage temperature, the more stable the storage environment, the shorter the storage time and the lower the nitrate content. By rinsing, blanching or frying, the nitrate content in vegetables can also be effectively reduced. [4]
In other words, if you want to avoid the intake of nitrite, going to a regular business is the key, and you must buy those foods that meet the pollutant limit in food; Second, we can flexibly choose rinsing, blanching, frying and other treatment methods to reduce the nitrite content in food; Finally, low temperature itself will inhibit the activity of enzymes, and one night is not long. According to the data consulted, the nitrite content of vegetables and tremella has not changed much after being stored in the refrigerator for one night. [5]
Although the egg shell looks complete and smooth, it actually has many tiny holes, so it is in danger of being polluted. In addition, boiled eggs are more easily absorbed by the human body. Therefore, it is more suitable for eating after being completely cooked than poached eggs. However, it doesn't matter if the eggs are contaminated overnight. If not, why not leave them overnight?
Finally, it really needs attention.
Aluminum pots and pans may precipitate aluminum whether cooking or storing food. When cooking dishes with aluminum utensils, the release of aluminum is nearly 1 times higher than that of iron pan, and the release of iron is less than 1/3 of that of iron pan. Among them, the refined aluminum pot has flat surface, easy to form oxide film, strong corrosion resistance and wear resistance, and less precipitates; The cast aluminum pot has many holes and the corresponding surface area is large. Because there are many impurities or alloys, the oxide film is poorly formed and the corrosion resistance is weak. [6] Long-term intake of aluminum may lead to dementia.
Therefore, whether cooking or storage, we should try to choose stable materials, such as stainless steel, ceramics, glass, iron and so on.
truth
As long as it is cooked and stored properly, food will not be toxic even if it is left overnight.
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refer to
[1] Xu and Yang. Research progress of spoilage ability of fish spoilage bacteria [J]. Hunan Branch, 20 10, 2010 (19):130? 133.
[2] Jiang Heyuan. Is overnight tea carcinogenic? There is no scientific basis [j]. Medical care, 20 13(2):59? 59.
[3] Shen Xiuying and Xu Xiaolu. Mechanism and influencing factors of nitrate accumulation in vegetables [J]. Agricultural environment and development, 1998, 15(3):4? 6.
Zhang, Wang Hao, Li Rui, et al. Effect of pretreatment methods on nitrate and nitrite content in vegetables [J]. China Journal of Food Hygiene, 2008,20 (3): 267? 269.
[5] Like a chicken. Eating tremella overnight can lead to nitrite poisoning? [EB/OL]。 (20 1 1-04- 12)[20 16- 10-24].。 The signed articles published on this website only represent the author's views and have nothing to do with this website. If there is any infringement, you are responsible.
Author: Zhao Yanchang