Compared with tap water, the pure water has been filtered many times, basically except some impurities that should not be contained in drinking water, but at the same time all kinds of elements contained in natural water have been filtered. Therefore, pure water is sometimes called deionized water.
When purified water enters the human body, it will dilute the ion concentration in the blood, and the nervous system and hormones in the body will react. After receiving the signal from the hormones in the body, the kidney will quickly adjust its excretion and reabsorption function, and expel the excess water to maintain the stability of the ion concentration in the blood.
But at this time, due to the discharge of too much water, the human body is in the state of water shortage, appear thirsty.
Through observation, we can find that when drinking pure water alone, the more you drink and urinate, the more thirsty you become.
Therefore, from this point of view, pure water is not as good as tap water.