In daily life, many families use tap water for cooking, while some use water treated with water purifiers.
In daily life, many families use tap water for cooking, while some use water treated with water purifiers... "Tap water contains chlorine, which can cause cancer if consumed for a long time." "When boiling water with tap water, there is always a layer of substance on the wall of the hot water kettle. Is this a carcinogen?" Is there really a relationship between raw water and cancer?
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Raw water contains chlorine and is used for cooking
Not only toxic but also carcinogenic?
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Where does chlorine come from in raw water?
Raw water refers to water that has not undergone sterilization treatment.
Due to the possibility of various bacterial and microbial contamination in natural water sources, without sterilization treatment, it becomes a "bacterial culture solution" that is directly transmitted from reservoirs to households through pipelines. Even after heating, it cannot suppress the toxins that have already been produced.
Therefore, current tap water generally needs to be disinfected with chlorine, and there may indeed be residual chlorine in unburned tap water.
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What is the impact of residual chlorine in water?
In fact, the chlorine content in tap water in China is very low and safe. The World Health Organization's (WHO) regulation for residual chlorine in tap water is no more than 5mg/L, while China's regulation is stricter at 4mg/L.
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In addition, the presence of chlorine does not necessarily indicate carcinogenicity. The International Center for Cancer Research classifies chlorine as a Class three carcinogen, indicating that there is insufficient evidence to prove its carcinogenicity.
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Cooking and steaming food can be reassuring
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Therefore, as long as there is no pungent odor in the tap water, there is no need to worry about cooking with raw water. And during the cooking process, raw water becomes boiling water, and the remaining chlorine is removed. In addition, the high temperature itself can also eliminate some bacteria.
Similarly, the online rumor that cooking food with tap water can cause cancer is also unreliable. During cooking, residual chlorine is mainly decomposed into chloride ions, chlorates, and oxygen. The first two will not evaporate, while the latter will not affect health, so there is no need to worry about chlorine 'sticking to food'.
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High incidence of kidney stones in China
Is it all caused by water scale?
Perhaps it is because people attach too much importance to water, and there have always been many "black pots" about tap water.
Some people blame the high incidence of kidney stones in China on tap water, believing that "when the tap water boils, a layer of scale will attach to the kettle. Drinking such water for a long time can easily lead to stones
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What is scale?
There is a certain amount of calcium and magnesium ions in the tap water consumed in daily life. After boiling, these substances will undergo chemical reactions and precipitate insoluble substances such as calcium carbonate and magnesium carbonate, which attach to the bottom of the kettle, which is also known as scale.
The main component of scale is carbonate substances, which enter the body and partially decompose. Some parts that cannot be decomposed will be excreted from the body with feces, and will not pose a threat to health.
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Drinking qualified tap water will not cause excessive calcium levels in the body, nor will it induce kidney stones. Moreover, drinking more water can dilute the concentration of calcium oxalate and calcium urate, which can actually help prevent the formation of stones.
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Tips for cleaning scale
Although scale does not affect health, it can easily affect the heating function of a hot water bottle. And there may be certain psychological barriers in both sensory and drinking aspects. It is recommended to regularly clean the scale:
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The dietary habits that truly affect the high incidence of kidney stones
Stones do not form overnight, but accumulate over the years. In life, those casual daily dietary habits may be accelerating the formation of stones!
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High oxalic acid food
High oxalic acid food
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High sugar foods
Although sugar is an important nutrient for the body, a high sugar diet increases the risk of urinary tract stones by increasing the excretion of calcium in the urine. Especially lactose, it can easily cause calcium oxalate to accumulate in the body and form kidney stones.
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High fat foods
If the body fat content is too high, it will reduce the calcium that can be bound in the intestine, increase the absorption of oxalates, especially when sweating more, drinking less water, and urinating less, it will accelerate the formation of kidney stones.
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High Purine Food
Purine food enters the human body and undergoes metabolism to produce uric acid. When uric acid levels are high, it can promote oxalate deposition in urine and form stones.
High Purine Food
*Thick broth and seafood (hairtail, sardine, anchovies, clams, silver carp, anchovies, etc.);
*Animal liver, such as chicken liver, duck liver, etc;
*Pork (hip tip), lamb, and lean and fat beef.
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Excessive protein intake
Long term excessive consumption of protein increases the content of uric acid, calcium, and phosphorus in urine. If these excess calcium, uric acid, and other substances cannot be effectively excreted from the body through the kidneys in a timely manner, it can easily lead to the formation of stones.
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What really causes cancer is this "water"
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Author: Fan Xiaoer
Source: CCTV Home for Dinner
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