In fact, most people may have the same experience. When you cook noodles or soup, you will find that the soup is too little or the soup head is too salty, so you will pour hot water into it to replenish enough water or dilute the salty taste in the soup.
Secondly, when making milk or instant noodles, directly take the warm water in the thermos bottle to boil, and then make it. This practice seems to be in line with economic benefits, which can not only save cooking time, but also save gas and water
However, according to the experiment, if the water is boiled repeatedly, the nitrate in the water will be converted into nitrite, which will turn the hemoglobin in the human body into nitrite hemoglobin, making the red blood cells lose their oxygen-carrying function.
Therefore, if you drink boiled water repeatedly, it may cause tissue hypoxia, shortness of breath, chest tightness, purple lips and nails, or easy to fall asleep. If it is more serious, "nitrite" may be transformed into carcinogen "nitrosamine" after it enters the body through the action of gastric acid.
In view of this, when you drink these repeatedly boiled water, you must remember that it will have a negative impact on your health. For the sake of health, don't save too much gas and don't be too lazy.