Why you should not boil water several times
'16.01.2020'
Source: Clever
Even in ancient times, people realized that raw water often carries a mortal threat: after drinking it, it happened that people were sick and dying. According to the records of Pliny the Elder, Nero invented boiling water. In his opinion, the water that was heated cooled more. And if you boil it, then “you can make it potable from bad and dirty water,” writes "Smart".
Today, boiling is still one of the most effective methods of disinfecting water. Director of the Research Institute of Human Ecology and Environmental Health named after A. N. Sysina, Academician Yuri Rakhmanin, claims: by boiling water, you primarily increase its infectious safety. Of course, its composition changes due to the fact that substances that, when heated, turn into a gaseous state, simply volatilize. Like, for example, oxygen. That is why it is better to take fresh water for tea, in which after bringing it to a boil much more oxygen will remain, which can not be said about water that has been boiled two or more times.
But a group of scientists from U.S. University of California is convinced that there is no oxygen in the water, the temperature of which has at least once reached one hundred degrees, and there is nothing alive at all. This is evidenced by the fact that flowers that are watered exclusively with boiled water die within a few days. Therefore, boiled water is called dead. Try pouring such water into the aquarium. Fish will die there in just a few hours.
Some mistakenly believe that repeated boiling of water only makes it purer and harmless. In fact, says physiologist, professor at the Virginia Polytechnic University, Brand Davy, this is not entirely true. The water becomes clean and safe after the first boiling, when all pathogenic bacteria are destroyed in it. And after the second - the structure of such water changes greatly. Due to the active evaporation of liquid in the remains of water, the concentration of salts, minerals and other substances increases, which in itself can be harmful to health. It can only be harmless if it was originally pure. And such on our planet remains less and less.
Scientists at Harvard University became the owners of data from 27 studies that have been conducted over the past two decades. Their conclusion is unequivocal: repeated boiling of water leads to an increase in the concentration of fluoride, arsenic, and nitrates in it.
On the subject: 6 mistakes in brewing tea that turn it into poison
And the water that we collect from the tap contains chlorine. With prolonged boiling, it reacts with the remains of organic substances. And the more times the water heats up, the more various chemical reactions occur. Many scientists claim that as a result of repeated boiling in water, carcinogens are formed, which can contribute to the development of cancer and even contribute to changes in the body at the genetic level. Candidate of physico-mathematical sciences, associate professor of NRNU MEPhI Vladimir Reshetov refutes this hypothesis. According to him, repeatedly boiled water does not bear such serious consequences.
But there are others. Rospotrebnadzor experts argue that modern kettles that turn off automatically, just boil the water, can do a disservice. Turning off instantly, they do not allow water to boil, therefore, there is no reason to believe that all harmful bacteria and viruses in such water are destroyed. For example, the causative agent of botulism dies only after 15 minutes of boiling.
