Repeatedly boiled water does not cause cancer. Some people believe that the amount of ammonium nitrite in repeatedly boiled drinking water increases, which can lead to nitrite poisoning and may induce cancer. However, studies have proved that even after repeated boiling, the nitrite content of the water quality that meets the national drinking water requirements is still very small, and the content after 20 consecutive boils is about 0038mg L, the concentration is lower than the national standard of 1mg L, which cannot reach the degree of toxicity, and will not cause cancer.
Foods that may really cause cancer include stale fruits and vegetables, improperly processed overnight leftovers, inadequately pickled pickles, cured meats, moldy grains and other products, as well as foods such as barbecues, barbecues, fried goods, etc. In the case of long-term consumption of large quantities, it may cause poisoning and there is a possibility of causing cancer, so it is necessary to pay attention to reducing the intake of this type of food in life.
In short, although repeatedly boiled water does not cause cancer, it does not completely kill bacteria in the process of boiling water, so repeatedly boiled water may be contaminated with bacteria, which may cause discomfort symptoms such as vomiting and diarrhea after drinking. If bacteria enter, it may also cause gastritis, enteritis and other diseases. Therefore, it is necessary to minimize the use of repeatedly heated water as drinking water to prevent water quality from being polluted.