So weak alkaline water is good for the body, and acidic water is not good for the body? Zhao, technical director of the Health Drinking Water Professional Committee of the Chinese Medical Association, said that the research report of the World Health Organization shows that the relationship between the PH value of water and human health has not yet been proved.
Tang Yi, a professor of chemistry at Fudan University and doctoral supervisor, believes that the PH value of gastric acid in human body is usually around 3, which is very acidic. However, due to the acid-base buffer system in the human body, there is almost no difference after drinking water with a PH of 5-8. Even if cola, orange juice and other drinks are very acidic, a small amount will not cause harm to the human body.
Bai, director of the Department of Rehabilitation, Shanghai Sixth People's Hospital, explained that weak alkaline water is really beneficial to human body, but ordinary people don't need to drink weak alkaline water. This is because the human body has a natural mechanism to regulate acid-base balance, and ordinary people only need to maintain a normal diet. On the contrary, if you drink weakly alkaline water for a long time, it will destroy the acid-base balance in the body and increase the burden on the body. He believes that if we must be "healthy", then he suggests that consumers drink more mineral-rich boiled water, which is more beneficial to the human body to some extent.
Standard:
PH value is only one of hundreds of indicators.
There are many criteria for evaluating a kind of water, such as water source, bacterial index, mineral content and so on. PH value is just one of them. In the "Hygienic Standard for Drinking Water" implemented by China from 65438 to 0986, the water quality standard of drinking water is specified in detail. Only in the sensory characteristics and general chemical indicators, the total hardness and turbidity of water are specified in detail, including the PH value must be between 6.5 and 8.5.
From July this year 1, the new national standards of Hygienic Standard for Drinking Water and 13 Hygienic Inspection Method for Drinking Water will be formally implemented. Even in the new standard, water quality inspection index has increased from 35 to more than 100, and PH value is only one of sensory characteristics and general chemical indexes.
Expert: Weak alkaline water is deceptive.
In response to Sen's claim that weak alkaline water can "improve acidic constitution", the reporter interviewed relevant experts.
Han Ping, a professor at Zhengzhou University's School of Food Engineering and director of China Nutrition Society, said: "The statement that weak alkaline water can improve acidic constitution is purely a rumor and has no scientific basis. People are not glass test tubes. If you pour something acidic into it, your body will become sour. If you pour something alkaline into it, your body will become alkaline. Man is an organism that has evolved over billions of years, and the acid-base balance is very complicated. The human body itself has a set of acid-base balance buffer system, which has a very strong self-balance ability, and the human body will not be at rest for a long time. At a certain point in time, the human body may be acidic, but it is generally short-lived, and will soon return to normal pH value (the pH value of healthy people's blood is constant at 7.35 ~ 7.45). Drinking a glass of water is an inorganic chemical reaction in the human body, which can not balance the acid-base balance of the human body at all, because normal food is a biochemical reaction in the human body, and the process is very complicated. It is ridiculous to say that drinking soda will play a health care role. "
Chen Yongchun, a nutritionist at the Provincial People's Hospital, also disagreed with the statement that weakly alkaline water can "improve acidic constitution". Dr. Chen said that the Dietary Guide for China Residents issued by the Nutrition Society of China has a special statement on this issue, and it also opposes similar statements.
The reporter saw the clear attitude of experts on this issue in the first part of Dietary Guidelines for China Residents, Dietary Guidelines for the General Population. One of the paragraphs reads:
"In some popular science articles in recent years, the propaganda about the acidity and alkalinity of food advocates' pay attention to the acid-base balance when choosing food', especially emphasizing that acidic food is harmful to health. These propaganda have had a great influence on our residents. From the perspective of nutrition, these statements lack scientific basis, so they are not worth promoting. "
After refuting the "food acid-base balance theory", the Dietary Guide for China residents clearly pointed out: "According to the" food acid-base balance theory ",all foods such as fish, poultry, eggs and lean meat are classified as" acidic foods ",which will make residents feel at a loss when choosing food. These foods are the main sources of energy, protein, vitamins and minerals. Without these foods, the nutritional intake of residents will inevitably be insufficient or lacking, so the growth and development of children and the nutritional status of adults will not be guaranteed! "
The viewpoint of Dietary Guide for China Residents is to advocate the principle of balanced diet, that is, "the food is diversified, mainly cereals, and the thickness is combined".
When searching online, the reporter found that "acid constitution leads to tumor" is also a "selling point" of "acid-base constitution theory". Earlier, Sun Yan, an academician of China Academy of Engineering and a professor at Cancer Hospital of China Academy of Medical Sciences, refuted this. He believes that "acidic constitution causes cancer" is simply "not worth mentioning". Many authoritative experts in the domestic medical field have publicly refuted the "acid-base constitution theory" before.
An insider pointed out that since the "theory of acid-base constitution" itself is untenable, the so-called "improving acid constitution" of weakly alkaline water is even more impossible to talk about.
AnnouncementNo. 10 of the Ministry of Health of People's Republic of China (PRC) and the People's Republic of China in 2005 "Recently, some production and business units involved in drinking water hygiene and safety products (hereinafter referred to as wading products) claimed to be able to prepare ionized water or alkaline water in the name of" ion water machine "without authorization, and publicized its various health care functions, and some even marked the approval documents of the health department without authorization to deceive and harm consumers. In this regard, our department reiterates as follows: First, our department has never approved any "ion water machine", and wading products may not claim any health care function. Second, some water quality processors have changed the content and scope of the license without authorization after obtaining the Approval Document of Hygienic License for Wading Products, refitted them into "ion water machines" for production and sales, or claimed health care functions. All localities should strictly investigate and deal with them in accordance with the Administrative License Law and the Measures for the Hygienic Management of Drinking Water. It is hereby announced. July 2005 1 1 day "
How to supervise the bottled water market
Sen's barreled weak alkaline drinking water is publicly sold in the market. How should the government supervise this phenomenon?
The reporter found that the hygiene license number of a publicly sold barreled weak alkaline drinking water is "Zheng Zi 2004 No.07666" and the implementation standard is "Q/ZSY02-2008".
The relevant person in charge of Zhengzhou Health Supervision Institute told the reporter that according to the regulations, enterprises must apply for a health license to produce food. If similar new products are produced, the new product items shall be indicated in the hygiene license. However, according to the relevant regulations, the health department is only responsible for reviewing and issuing health permits. The daily food safety supervision is mainly undertaken by the quality and technical supervision and the industrial and commercial departments.
It is understood that in June 2005, the Zhengzhou Municipal Government issued the Opinions on Strengthening Food Safety Management. It is stipulated to set up municipal and district food and drug safety committees to lead, organize and coordinate food safety work in this region.
According to the relevant person in charge, the implementation standard of Sen's weak alkaline drinking water instructions belongs to enterprise standards. According to the regulations, products with national standards implement national standards, and products without national standards implement local standards. Enterprises can implement enterprise standards, but they should file with the quality and technical supervision department. At present, there are no national standards or relevant local standards for products such as weak alkaline water and negative ion water.
Xie, a senior lawyer in Zhengzhou, believes that although the relevant enterprises try to evade supervision on the grounds that there are no relevant standards, Article 22 of the Food Hygiene Law clearly stipulates: "The products and instructions of foods with specific health care functions must be reported to the health administrative department of the State Council for examination and approval, and its hygiene standards and production and operation management measures shall be formulated by the health administrative department of the State Council." Obviously, the label of "improving acidic constitution and reducing diseases" means that it has a specific health care function. From this perspective, if this product is not approved by the Ministry of Health, it is illegal.
The reporter noticed that there are many so-called "popular science" articles on the Internet. However, it is worth noting that there are often some products behind such articles, and some media have suspected that this is a marketing tool. The website of a health care product manufacturer in Xinjiang is full of "popular science articles" about "acid-base constitution", claiming that all kinds of cancers are related to "acid constitution". The product they provide-"tea horse ancient alkaline food" has the effect of "expelling acidic substances from human body and correcting human pH", and it is expensive. A small bottle 10ml of essential oil costs 358 yuan, and a bottle of 90 capsules is sold in 280 yuan. In addition, novel products such as "weak alkaline water cup", "alkaline ionized water" and "natural green algae" have also hitched a ride on the theory of acid-base constitution.
People concerned call on government departments to plug the loopholes in the supervision of such foods as soon as possible, and don't let businesses use pseudoscience to fool people into making profits.
Can drinking "weakly alkaline" water make people healthier? "The article can't help but say a few words.
With my limited knowledge of human physiology, I know:
1. Compared with the changeable environment outside the human body, the internal environment of the human body (not the respiratory tract and digestive tract environment, but the environment in which various tissues and cells are located) is relatively stable, such as temperature, blood sugar value, PH value, etc. This is not to say that it is not affected by the external environment, but that the human body has a series of self-mechanism adjustments (mainly through the adjustment of nerves and body fluids) to achieve a relatively stable state.
If the self-regulation mechanism of human body is unbalanced, it will lead to acid-base balance disorder and corresponding diseases (such as metabolic acid-base poisoning).
2. Several concepts:
Acid and alkali;
According to the broader definition, acid can provide protons in the reaction, and vice versa, while the narrow definition is that substances that can ionize hydrogen ions in water without producing other cations are called acids. A compound in which all anions are hydroxyl ions (OH-) when ionized is called an alkali.
PH value:
The pH value is the common logarithmic negative value of hydrogen ion concentration, that is, pH=-lg[H+]. Usually, the pH value is a number between 0 and 14. When pH; At 7, the solution is alkaline, and at pH=7, the solution is neutral.
For example, 3
The PH value of normal blood ranges from 7.35 to 7.45. Although a certain amount of acidic and alkaline substances (due to food digestion) enter the blood every day, the PH value of the blood is still between 7.35 and 7.45. The reason is that the buffering substances in plasma are working, such as the most important HCO3—- (bicarbonate ion) -H2CO3 buffering pair, and the amount of the two is in a certain proportion (relationship: H2CO3->; HCO3-+H+，HCO 3-+H-& gt； H2CO3, if encountering acidic substances, hydrogen ions H+ combine with bicarbonate, reducing part of free H+ and increasing the generated H2CO3; On the contrary, when encountering alkaline substances, hydroxyl ion OH- combines with H2CO3 carbonate, reducing the increase of some free OH- and HCO3-. If you encounter acidic substances, such as lactic acid and ketone bodies, the amount of carbon dioxide will increase, and the partial pressure of carbon dioxide will increase, thus stimulating the respiratory center and discharging it through the lungs, thus making the acidity in the blood relatively stable. On the other hand, when alkaline substances are encountered, HCO3- increases and is excreted from urine through the kidney.
In short, it is because the blood has a certain acid-base buffer system and neurohumoral regulation mechanism, while the lungs and kidneys excrete more acidic or alkaline substances, which cooperate with each other to maintain the relative acid-base balance in the human body.
4. Acid-base imbalance
In some special cases, if the metabolism in the body produces too many acidic or alkaline substances, which exceeds the regulatory capacity of the human body, or the regulatory mechanism is blocked, it will lead to acid-base imbalance and cause corresponding diseases.
For example, the excretion mechanism of lung and kidney is blocked or its function is low due to pathological effects, which will lead to acid-base imbalance; For example, respiratory acidosis is a small amount of carbon dioxide discharged from lung diseases, which stays in the body.
5. Summarize in one sentence
The acidity and alkalinity of the food you eat will not directly lead to the acidity and alkalinity of the human body's internal environment, because the human body has certain self-regulation ability unless the self-regulation mechanism is hindered.
6. Is the food acidic or alkaline?
Personally, I think there is still some. Some foods, such as oranges and apples, may accumulate more acidic substances, while some foods may accumulate alkaline substances. However, this classification is only the classification of nutrients. Even if it is eaten for a long time, it will not simply lead to the so-called acidic constitution or alkaline constitution after digestion and absorption. What is the concept of acid-base toxicity is to use consumers' concern for health to fool consumers' advertisements.
Farmer Spring-[じ☆じ Pseudo-scientific Verification Experiment Jing ve {Funny}] Copyright statement: Please indicate the original source, author information and this statement in the form of hyperlinks when reprinting.
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As a middle school student in the new century ...
A few days ago, the school distributed test paper and water for Nongfu Spring. As an advertisement, I collected a lot of test papers and did experiments at home.
There are 12 test tubes washed with distilled water. Due to limited conditions, 6 tubes are large and 6 tubes are small.
On the left is 1- 14. On the right is a brochure issued by Nongfu Spring, and there are a bunch of searched test papers.
Brief introduction of what acidic water and alkaline water.
If the ph value of human body is 7.3, the gastric acid is still 1-2. Why not say it?
Is it to inject Nongfu Spring directly into the vein?
Here comes the mistake!
PH=7, it is weakly alkaline! ! !
It says that it is recommended to use 5.5-9 precision test paper, so why is the logo of 1- 14 wide test paper printed?
Through a large number of test paper comparison tables next to 1- 14, there is little difference in color.
In the first experiment, the pH value of Nongfu Spring was measured.
In order to make it easy to distinguish, the big test tube contains all kinds of ordinary 1- 14 test paper, and the small test tube contains farmers' test paper.
After joining Nongfu Spring, the color immediately faded as advertised, but the ordinary test paper did not change.
Second, tap water.
After all of them are added, the ordinary test paper has not changed, and the farmer's test paper will still fade, and the color is the same as that of Nongfu Spring water.
The third item, distilled water
After adding it, the farmer's test paper faded in water with pH=7, but the color was 7 on the sun visor.
Item 4: dilute sulfuric acid
Add 6mol/L dilute sulfuric acid, and the pH value is about 1.
Ordinary test paper does not fade and is bright red. Farmer's test paper hasn't changed or faded at all. ...
Item 5: Sodium hydroxide
Now, after a few pieces of sodium hydroxide are dissolved, the ordinary test paper turns into a big purple, which is a strong alkali.
Nongfu Spring faded and became blue.
Item 6: 5% sodium bicarbonate solution
After adding, the ordinary test paper shows the color of 8, while Nongfu Spring test paper still fades and shows alkaline color.
Summarize all the experiments.
The experiment shows that Nongfu Spring test paper has strong fading property, which is not as good as the color light of genuine pH test paper.
If it's a test paper with a precision of 5.5-9, then why use the legend of 1- 14 to deceive consumers! ! ?
P.s7.3+-0.5, don't tell me this is weak alkaline water. ...
The solution should be sampled with a glass rod, not thrown in. ...
It can be said that pseudoscience has guided the new trend of consumption. With the sale of aquatic products, the "dirty" experts fabricated a set of "dirty" theory to deceive people:
It mainly consists of two parts:
1, the acid-base environment in the body affects health and should be kept weakly alkaline.
Comments: It involves complex physiological and biochemical background.
2. Therefore, it is necessary to drink weakly alkaline water to adjust the pH value (pH) in the body.
Point 1 No comment.
The second point is sheer nonsense, bullying the people of the whole country and never learning chemistry!
The so-called weakly alkaline water has a pH of about 7.5. How much alkali does it contain?
The pH of the solution is the negative value of the logarithm of the molar concentration of H+ ions in the solution, while H+×OH-= 10-14.
Simply put, the alkali concentration of pH 14 is about 1, and that of pH 13 is about 0. 1.
The alkali concentration is about 0.0 1 at pH 12 and 0.00 1 mol/L at pH1.
.......
The alkali concentration of pH8 is about 0.00000 1, that is, 10 -6.
PH7.5 Alkali concentration is 3.2×10-7 mol/L.
Ok, what happens when you put a mouthful or a large glass of weakly alkaline water in your mouth?
Saliva contains a lot of bioactive substances, such as protein and enzymes. These substances have a certain isoelectric point and have a strong buffering ability to the pH value of the solution.
(The acid or alkali in the buffer solution has little effect on its pH value, so the content of the first year of college chemistry can not be clearly stated in one sentence. )
In short, a saliva foam is enough to change the pH value of so-called weakly alkaline water into the pH value of saliva foam. What's more, water will eventually enter the stomach, and the PH value of gastric juice is 1, which is strongly acidic.
In short, the so-called weakly alkaline water, from the moment it comes into contact with the oral cavity, has no effect, just like ants on a swing, which decides whether it will rise or fall.
As long as the water is clean, does not contain too many pollutants and has a certain amount of beneficial minerals.
I'm afraid the so-called pH value only reflects the amount of dissolved carbon dioxide.
Throwing out a pseudoscience of weakly alkaline water shows the money in the pockets of ordinary people.
Good people, think of P as a seller of weak alkaline water.