Is it okay to drink the boiled water in the thermos overnight?

The boiled water in the thermos overnight can be drunk, but the tea that has been left overnight cannot be drunk. There are no carcinogens in boiled water overnight. If there is no material basis in the water overnight, carcinogens will not be born out of thin air. Nitrite, the carcinogen that people are most worried about, must be produced on the basis of nitrate, but ordinary drinking mineral water or purified water either only has minerals and trace elements, or has nothing at all. In this case, it is carcinogenic Matter is not born out of thin air. As long as the source of water quality can be guaranteed to meet the safety standards, no matter how the water is burned, it will not produce carcinogens. However, overnight tea will produce amino acids and other substances, which will easily lead to the proliferation of microorganisms over time, so it is not suitable for drinking. Tips for drinking water in the morning: 1. Boiled water has no protein, carbohydrates, fat and any calories. It can be called the water with the least “burden”. It can be absorbed by the body without digestion, so that the blood is quickly diluted and blood circulation is promoted. Drinking a glass of plain water in the morning is the best choice. It can not only replenish the water needed for human metabolism, but also reduce blood viscosity and facilitate the excretion of urine. 2. Many health-preserving opinions believe that drinking a cup of light salt water in the morning is good for health and has the effect of preventing constipation. However, there is no evidence-based medical data to prove that light salt water can treat constipation. On the contrary, there are clear data that prove that excessive sodium intake will increase blood pressure High, harmful to the body. The concentration of normal saline is 0.9%, and the taste is very salty. If the concentration is reduced to 0.2%, that is, 1 gram of salt is added to 500 ml of water. People can accept it from the taste, but adults eat 5 grams of salt per day. “Light salt water” eats 1/5 of the salt in a day, and eating other foods that day is likely to make the salt exceed the standard. Therefore, from the perspective of controlling salt intake, not everyone is suitable for drinking light salt water, especially those with high blood pressure and kidney disease should be prohibited.