March 22 is World Water Day. Water is the source of life, we have to consume a lot of water every day, but do you really know how to drink water? Nowadays, there are many opinions about drinking water on the Internet, such as drinking overnight water can cause cancer, drinking 4 liters of water a day will cause poisoning, drinking water with a lot of limescale is prone to suffering from stones...... On the occasion of World Water Day, the life version sorts out The four major drinking water rumors circulating on the Internet allow you to drink water clearly.
Drink overnight water and thousand boiled water is carcinogenic?
The truth: the nitrite contained in it does not exceed the standard value
"Drinking overnight water, thousands of boiling water cause cancer" has been rampant in the WeChat circle of friends for many years, and many elders are convinced of this. The rumor claims that overnight boiled water And the water that has been boiled many times (commonly known as thousand boiling water), both contain nitrite , which is a carcinogen. Is it really the truth?
Fan Zhihong, an associate professor at the School of Food Science and Nutritional Engineering, China Agricultural University, said that the carcinogen that people are worried about—nitrite must be produced in substances that contain nitrates, while ordinary drinking water contains only minerals and minerals. Trace elements, or nothing, in this case carcinogens will not appear out of thin air. As long as the source of the water meets the standards, in theory, no matter how much water is burned, it will not produce carcinogens.
“You don’t have to worry about the excessive nitrite in the overnight water and Qiangun water.” Ruan Guangfeng, director of the Science and Technology Department of Kexin Food and Nutrition Information Exchange Center, said in an interview with a reporter from Science and Technology Daily that overnight water and Qiangunshui are often detained. The label of "excess nitrite" is associated with "carcinogenic". The truth is that even if the water is repeatedly boiled 20 times, the nitrite content cannot reach 3% of the upper limit value required by the national drinking water standard. Experiments have also proved that the nitrite content of water overnight (or even several nights) is far from the over-standard value.
In addition, Ruan Guangfeng specially reminded that although the boiled water overnight is not harmful to the human body, drinking the tea overnight is indeed bad for health. "This is mainly because the water after tea soaking will produce amino acids and other substances, which will easily breed microorganisms over time."He said.
Drinking 4 liters of water a day will be poisoned?
Truth: As long as you don’t drink it for a short period of time, you don’t have to worry about it
catch a cold? Drink plenty of water! Headache? Drink plenty of water! In a bad mood? In the eyes of many people, drinking more water seems to be the “perfect solution” to solve all problems.
However, there are rumors on the Internet that World Health Organization expert Bruce Gordon said that drinking more than 4 liters of water per day is possible. Poisoning can even lead to damage to brain function, and in severe cases, it may be life-threatening. Although the World Health Organization claimed that this view was misunderstood and promptly refuted the rumor, many people still faintly worry that drinking more water will cause health problems. Does it affect?
The body fluid volume of normal adults accounts for about 60% of body weight. There are two main ways for humans to obtain water: one is from food, about 700 to 2000 ml per day, which are mainly from the gastrointestinal tract Absorption; The second is that the human body produces about 300 ml of water every day in the metabolic process. Most of this water will form urine and be excreted through the human urinary system, and a small amount will be excreted through the lungs or skin in the form of water vapor or sweat.
P2p related experts said that there is indeed the concept of " water poisoning" in medicine. When the body's intake of water greatly exceeds the amount of water discharged, the water stays in the body, which in turn causes the plasma osmotic pressure to drop and the circulating blood volume Increased, it may cause water intoxication. It is also called dilutional hyponatremia. According to the severity of the disease, the disease can be divided into acute water intoxication and chronic water intoxication.However, water intoxication is actually very clinical in nature. It rarely occurs. Even if the patient really has water intoxication, it is mostly not only due to excessive drinking, but also because the patient has other problems or received some inappropriate treatment operations. For example, the patient has kidney disease and heart disease. Insufficiency, drinking too much water after exercise, and too much iatrogenic infusion, which may lead to water intoxication. In fact, healthy people's kidneys are very adaptable and will not "strike" just because they drink more water. _P5p
"As long as it is not drunk in a short period of time, it will not affect health. Ruan Guangfeng said.
Drinking water with more limescale is more likely to get stones?
The truth: hard water tastes bad,But it will not harm your health
After using the kettle for a long time, thick scale will form on the inner wall. It is widely rumored on the Internet that long-term drinking of hard water with a lot of limescale after boiling will increase the risk of stone disease. So is this statement true or false?
Ruan Guangfeng said that the formation of scale is related to the hardness of water. The water in the north of my country is harder than that in the south. This is mainly because contains more calcium ions and magnesium ions. Called hard water). Calcium ions and magnesium ions contained in the water will become insoluble mineral salts when heated at high temperatures, and precipitate in the kettle, thus forming scale.
"However, there is currently no conclusive evidence that drinking hard water can cause stones or other health problems. On the contrary, if people drink less water and eat more, their urinary system is more likely to have stones." Ruan Guangfeng said .
"Drinking hard water can cause stones, which is a complete rumor. Although hard water tastes bad, it is harmless to the human body. The calcium and magnesium contained in it are both essential elements for the human body, and most people now consume calcium and magnesium. The amount is low. In this sense, drinking water with high hardness can also replenish some minerals to the human body. Of course, the mineral content in hard water is far from what the human body needs in daily life. The right way to supplement minerals is to be balanced. Food." Ruan Guangfeng said.
Drinking pure water causes osteoporosis?
The truth: the main cause of calcium loss is age, hormone levels, etc.
There are rumors that purified water is called poor water. When it is processed, the "life ions" that nourish the human body are also removed The more you drink this kind of water, the more acid your body fluid will be. Moreover, purified water will bring a large number of trace elements in the body to the body, so that people will suffer from osteoporosis and rickets. So, are these claims true?
purified water is water prepared by reverse osmosis or distillation, with most impurities removed. Lu Qing, an associate professor at the School of Public Health of Tongji Medical College of Huazhong University of Science and Technology, said in an interview with the media that pure water does not contain any trace elements, but after treatment, the essential mineral elements such as calcium, magnesium, potassium, and sodium are significantly reduced.
"The normal pH of human body fluids is between 7.35 and 7.45, although the body is constantly producing and ingesting substances with different pH levels.But the pH of body fluids does not change significantly. Purified water is neutral or weakly acidic. It is adjusted by the body's gastric juice and absorbed by the intestines, and will not change the pH value of organs or other tissues. Therefore, for the human body, drinking pure water does not make body fluids more and more acidic. "Lu Qing said.
Regarding the statement that long-term drinking pure water can cause osteoporosis and rickets, Zhong Kai, deputy director of the Kexin Food and Nutrition Information Exchange Center, said that people holding this view are not aware of the physiological conditions of the human body. Understand. An adult weighing 60 kilograms weighs approximately 36 to 42 kilograms of body fluids, and his daily drinking volume is usually no more than 2 liters. This amount of water drinking has no effect on the calcium ion concentration in his body, leading to the loss of calcium in the body. The main factors are age, hormone levels and dietary intake, etc.
On the other hand, the cause of rickets is insufficient vitamin D intake, low calcium content in the body, insufficient sunlight, etc. The human body intakes calcium, magnesium, etc. The main way of element is daily diet, not drinking water. Therefore, drinking pure water is not related to the occurrence of rickets.
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