The scientists noted that repeated boiling of water has an adverse effect on human health. Oncology and mental retardation is only part of the possible problems. It is therefore recommended to bring water to 100°C only once.
Some people think twice boiled, the water becomes cleaner. In some ways this is true (most of the microorganisms are killed), but other than that, the water concentrates many harmful substances, but also significantly decreases the amount of oxygen. In particular, in the water accumulate nitrates, fluoride and arsenic.
Arsenic, in turn, is able to cause enormous damage to the gastrointestinal tract and the kidneys. Additionally, this poison can cause diabetes and even cancer.
Fluoride also negatively affects the body. Developing when exposed to high temperatures in fluoride, it slows down mental processes, especially in children, can also cause infertility in women.
Nitrates are also suffer transformation, they turn into nitrosamines, which are carcinogens. These chemicals can cause cancer, cause eating disorders, problems with the pancreas and urogenital system.
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Carcinogens are formed during the reaction of chlorine with organic substances. As you know, chlorine in tap water abound. Thus, it is quite concentrated the liquid.
Besides all this, it is worth considering the continually accumulating on the walls of kettle salts and minerals. They are often the cause of stones in the body.
Based on the foregoing, we recommend that each time to change the water in the kettle, and the dishes from time to time to clean inside. Do not put too much water, pour into kettle as much as you can drink at one time.