Why are there bacteria in boiled water overnight?

Don't drink water at night. If it is cold for a long time, it is comparable to chronic poisoning, and repeated boiling water will cause cancer ... The rumors about boiling water are really hot these days. Is it true or not? In fact, when the temperature is higher than 80℃, water is absolutely safe, because this temperature is enough to kill microorganisms. When the water temperature drops below 60℃, the water environment is very suitable for the growth and reproduction of bacteria.

How long will the water go bad? Because water is affected by external temperature and other objective environment, there is no fixed time. In summer, when the temperature exceeds 30℃, the air humidity is high, and the bacteria multiply quickly, which is easy to pollute the water body and cause human diarrhea. Therefore, it is best not to drink overnight water in summer, and it is best to put overnight water in a covered container, such as a thermos in winter. Experts suggest that boiled water should not be kept for too long, and it is best not to drink boiled water after a few days. Bottled pure water on the water dispenser is generally recommended to be drunk within one week. In particular, drinking too much water may lead to hyponatremia and even water poisoning. Drinking water is a good habit, but drinking a lot of water has no other effect on losing weight. Proper drinking, sleeping and a balanced diet can keep nature healthy and beautiful.

If there is no material basis in overnight water, carcinogens will not be produced out of thin air. Nitrite is the most worrying carcinogen, which must be produced on the basis of nitrate. And ordinary drinking mineral water or pure water contains only minerals and trace elements, and nothing else. In this case, carcinogens will not be produced out of thin air. As long as the source water quality can meet the safety standards, no matter how much water is burned, it will not produce carcinogens in theory. However, overnight tea will produce amino acids and other substances, which will easily lead to microbial reproduction after a long time, so it is not suitable for drinking.

If the water in the drinking fountain is left for too long, it will not be as fresh as before, such as bacterial pollution, but it will not change much for other substances. At present, the heating temperature of drinking fountains is generally 100℃, and the water quality will not change obviously even if it is boiled repeatedly. If the water quality is qualified and the nitrate content is low, the amount of nitrite produced after boiling will be less.

Ascending reflex and gastrocolonic reflex after getting up can promote the peristalsis of colon group and produce defecation reflex. For people with poor digestive system, drinking any kind of water in the morning can promote defecation. After water enters the human body, gastrointestinal peristalsis produces a desire to defecate, which has nothing to do with "yin and yang water". Some people have strong immunity, and "yin and yang water" has little effect on them and will not have much influence. People with low gastrointestinal immunity should try to use clean drinking water.

Water plays a role in transporting nutrients in the human body. Dirty water has a poor carrying effect on nutrients, which will affect health. We should try our best to make safe drinking water.