For example, some studies believe that if water is repeatedly heated and boiled for a long time, the nitrite content in it will increase. If you drink this water with excessive nitrite for a long time, it may lead to an increased risk of cancer.
However, if we only drink a lot of water in a relatively short period of time, for example, I didn't finish it when I went to bed tonight and it was hot again the next day, then it doesn't matter much if this short-term residual water is only heated again every once in a while.
Of course, our advice for daily boiling water and drinking water is that if there are conditions and enough time, don't burn too much water at a time, and drink it as soon as possible after burning. It's best not to leave anything behind.
However, if you are busy going to work to see the baby every day, it is really a matter of boiling water. The kettle at home is relatively large, and you really can't finish it at one time. Try to heat it once the next day to avoid further growth of bacteria in the water for a long time, and then eat it as soon as possible. If it's really left for a long time, then it's best not to drink it.
If you can, try not to drink overnight water, and try not to reheat it the next day. Although this has no obvious direct effect, long-term drinking is not good for health.
You can't drink water overnight, mainly because some bacteria or microorganisms in the water have been fully killed after boiling, but if it is left for too long, it may breed fungi or microorganisms to some extent.
So if the water is not heated repeatedly overnight, it may cause some digestive system problems because of the existence of this microorganism or some bacteria.
But for overnight water, it is not recommended to boil it again before drinking it, because repeated boiling will lead to the increase of nitrite in water to a certain extent. Although nitrite itself does not cause cancer, nitrate will form nitrosamines to a certain extent after entering the human body, which is an obvious carcinogen.
Therefore, if people drink boiled water, it is generally recommended to turn off the power supply two to three minutes after the water boils, and then try to finish it on the same day after the water cools. This newly boiled water can not only effectively kill some bacteria and microorganisms in the water, but also effectively avoid the increase of nitrite in the water caused by repeated boiling.
In the choice of kettle, you can also choose some food-grade stainless steel materials or copper products, and try not to use some kettles that do not meet the food grade, which may cause some heavy metal poisoning.