Every morning, many people press the switch on an electric kettle to prepare a warm cup of water for the day. But few realize that this familiar daily habit, if done incorrectly, may gradually introduce harmful substances into the body.
An ordinary household kettle, when misused over a long period, can quietly become a source of accumulated toxins. Below are three common water-boiling habits that many people overlook, yet which may pose potential health risks to the whole family.
1. Reboiling Old Water Repeatedly
Many people have the habit of leaving leftover water in the kettle overnight, adding fresh water the next morning, and boiling it again to save time and effort. However, repeatedly boiling the same water can cause certain harmful substances to accumulate.
When tap water is boiled for the first time, nitrite levels are relatively low. But with each repeated boiling, as water evaporates, nitrites remain while new nitrates are added from fresh water. Over time, nitrite concentration can increase significantly.
Once ingested, nitrites may react with amines in the stomach to form nitrosamines, which are known carcinogenic compounds. Long-term consumption of repeatedly boiled water may increase the risk of digestive system cancers, especially stomach cancer.
Key point: Fresh water should be used each time, and leftover water should not be reheated multiple times.
2. Keeping the Kettle Lid Tightly Closed While Boiling
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