I. Unboiled Water – Bladder Cancer, Rectal Cancer
Experts point out that drinking unboiled water increases the risk of bladder cancer and rectal cancer by 21%-38%. When the water temperature reaches 100°C, these two harmful substances will greatly decrease as they evaporate with the steam. If boiled for an additional 3 minutes, the water is safe to drink.
II. Re-boiled Water – Diarrhea, Bloating, Coma and Convulsions
Re-boiled water is water that has been boiling on a stove all night or for a long time, as well as water in an electric water heater that has been boiled repeatedly. Due to prolonged boiling, this water has high levels of non-volatile substances, such as heavy metals like calcium and magnesium, and a high nitrite content. Drinking this water for a long time can interfere with gastrointestinal function, causing temporary diarrhea and bloating. Toxic nitrites can also cause hypoxia in the body, and in severe cases, lead to coma, convulsions, and even death.
III. Steamer Water – Premature Aging, Cancer
Steamer water is the leftover water from steaming foods like steamed buns, which has been used multiple times. The nitrite concentration in repeatedly used steamer water is very high. Drinking this water frequently or using it to cook congee can lead to nitrite poisoning. Water scale often enters the human body with the water, which can also cause digestive, nervous, urinary, and hematopoietic system disorders, and even lead to premature aging and cancer.
IV. Aged Water – Esophageal Cancer, Stomach Cancer
Commonly known as "dead water," aged water is water that has been stored for a long time without moving. Drinking this water often can slow down the cell metabolism of minors, affecting physical development. For middle-aged and elderly people, it can accelerate aging. The increasing incidence of esophageal and stomach cancer in many old places may be related to long-term consumption of aged water. The toxic substances in aged water also increase with the length of storage time.