As the saying goes, “Food is the most important thing for people, and water is the first food.” Maintaining sufficient drinking water every day plays a vital role in the health of human skin, blood vessels, and intestinal tract. important role.
◎Maintain good skin: the skin has sufficient moisture, fast metabolism, less prone to wrinkles and spots, etc., and looks younger;
◎Reduce respiratory diseases: the mucous membrane of the respiratory tract is relatively moist, and the secreted mucus helps to reduce the invasion of germs;
◎Blood flow is smoother: Sufficient water helps blood flow smoothly, and the risk of thrombosis is relatively lower;
◎Prevention of constipation: Sufficient water can prevent dry stool and prevent constipation…
But there are many rumors about drinking water in life Statements, such as: you can’t drink plain water for more than 16 hours, drinking scaled water for a long time is easy to get kidney stones, drinking soda water can reduce uric acid… Are these statements true or false?
Boiled water is also available “Shelf life”
If it exceeds 16 hours, you can’t drink it?
Some people say: “Boiled water also has a ‘shelf life’. If it exceeds 16 hours, E. coli will multiply in large numbers, causing abdominal pain, diarrhea, Fever and nausea, can’t drink anymore.” In fact, there is no scientific basis for this claim, as E. coli is not airborne.
In this regard, researchers from Fuzhou University conducted a special experiment:
The researchers divided the boiled water into two groups with a cover and without a cover, and left it for 5 hours, 8 hours, 11 hours, 14 hours, 15 hours, 16 hours and 17 hours, and monitored whether the water contained E. coli .
The results show that, no matter whether it is covered or not, after the experimental time is reached, the There is no E. coli in the boiled water in the water glass.
However, E. coli may contaminate water supplies through feces, sounpasteurized water is the best Don’t drink.
In addition, in summer, the temperature is high and the humidity is high. It may contain other bacteria, so it’s better not to drink it, especially for children or people with weak stomach and intestines.
Drinking scaled water for a long time
Easy to get kidney stones?
After using the kettle at home for a period of time, there is often a layer of white scale on the bottom of the kettle. There are rumors that “this It is hard water, drinking too much is easy to get kidney stones”, is this really the case?
In fact, most of the scale is formed because the water contains more calcium and magnesium ions.
my country’s “Drinking Water Sanitation Standard” stipulates: The total hardness of drinking water (calculated as calcium carbonate) No more than 450mg/L, equivalent to 180mg of calcium in 1L. Adults usually drink no more than 2L of water per day, plus the daily calcium reference intake is 800mg, and the maximum tolerable intake is 2000mg.
It can be seen from this, Drinking water normally will not cause excessive calcium in the body, let alone induce renal failure Calculus.
Secondly, drinking plenty of water can dilute the concentration of calcium oxalate and calcium urate, which can help prevent the formation of kidney stones and even excrete existing kidney stones of small stones.
Drink more soda
Can it regulate acid-base constitution and lower uric acid?
Soda water, that is, water containing sodium bicarbonate, is weakly alkaline. There are rumors that drinking it regularly can change the internal environment of the body, correct acidic constitution, and reduce the risk of disease; there are also rumors that it can lower uric acid. What are the facts?
1. Acid-base constitution is a lie, the internal environment cannot be easily changed
First of all, “acid-base constitution” is a lie at all. There is no saying that diet and drinking water can regulate constitution.
What’s more, The human body has a complete body fluid regulation system, which can stabilize the pH value of the internal environment Between 7.35-7.45, it is impossible to change through food and drinking water.
Therefore, for the general population, there is no need to deliberately pursue weak alkaline water, and maintaining good living and eating habits can maintain the acid-base balance of body fluids , Come on for your health.
2. Relying solely on soda water to lower uric acid may be a bit difficult
Theoretically speaking, soda water can alkalize urine, increase the solubility of uric acid, and promote the excretion of uric acid.
But it is not possible to reduce uric acid simply by drinking soda water, becauseSoda water sold on the market , the content of sodium bicarbonate is so low that it can be ignored, it is difficult to change the pH of urine, let alone lower uric acid. 
Of course, for patients with high uric acid, drinking some soda water is not harmful, after all, drinking more water can promote excretion of uric acid.
Drink more lemonade for whitening?
The effect is limited, drinking the wrong one will hurt you
There is a saying that “one white covers all ugliness”. Among various whitening methods, fresh and delicious lemonade is especially popular. But can drinking lemonade really whiten your skin?
1. Drinking lemonade for whitening has limited effect
It is believed that lemon is rich in vitamin C, which can reduce skin melanin and has a certain whitening effect.
Indeed, vitamin C can inhibit the activity of tyrosinase, reduce the production of melanin from the root, and can also dilute melanin and brighten The role of skin color.
But it is unscientific to talk about efficacy regardless of dosage. The vitamin C content of lemon is about 22mg/100g, which is not very high, soIt is difficult to achieve whitening effect by drinking a few slices of lemon in water every day /strong>.
< p data-track="48">2. Drink too much, or cause stomach discomfort
Since a few slices of lemon soaked in water are useless, can I soak a few more slices and drink more every day?
Actually, it’s not good to drink too much blindly——Lemons are rich in fruit acid and citric acid , malic acid, etc. Excessive intake will irritate the gastric mucosa and cause stomach discomfort, especially those who have underlying diseases such as gastritis and gastric ulcer should be more careful.
In general, if you want to whiten, you should do a good job of sun protection, and ensure 300~500g of vegetables and 200~350g of fruits per day Ingestion is relatively reliable. You can also choose skin care products containing niacinamide, arbutin, vitamin C and other ingredients.
Drink 8 glasses of water a day?
This amount is enough, but different groups of people have differences
The saying “drink 8 glasses of water a day” is widely spread, and many people insist on doing it. But have you ever thought about how big a cup should be used for these 8 cups of water? Obviously, this statement is not very accurate.
How much should I drink every day? Is this standard suitable for everyone?
1. Daily water intake, this standard is enough
“Dietary Guidelines for Chinese Residents (2022)” states thatadult men with low levels of physical activity should drink 1700ml a day, and adult women should drink 1500ml a day .
If the weather is hot, the air is dry, sweating a lot, etc., you should increase the amount of drinking water appropriately according to the actual situation. You can pay attention to your urine. If the color is light yellow, clear, and the amount is sufficient, it means that the amount of drinking water is basically sufficient.
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2. These people should control the amount of drinking water
The above drinking water standards are for healthy people, and some special groups should be treated differently, such as:
◎< strong>Patients who are taking medicine to treat gastric ulcer: The medicine contains sucralfate, aluminum hydroxide gel and other substances, which will protect the gastric mucosa. Too much may reduce the efficacy of the medicine, which is not conducive to the recovery of the disease.
◎Patients with chronic kidney disease: Kidney function affected When the body is damaged, the water taken in cannot be excreted normally out of the body, so the amount of drinking water should be controlled. Generally, the appropriate amount of water throughout the day (including drinking water and water in the diet) = 500ml + the amount of urine the day before;
◎Patients with heart failure: Drinking a lot of water will increase the amount of blood returning to the heart, which will increase the load on the heart and aggravate the condition. For those with severe heart failure, the amount of drinking water should be controlled within 800ml.
Specific water intake , subject to doctor’s advice.
Keep in mind the “3 don’ts”
Master the correct way to drink water
Drinking water may seem simple, but many people do it wrong. According to the “China Water and Quality of Life Cognitive Survey Report”, 95.3% of people in my country do not know how to drink water.
Drink water correctly, the following 3 points should be kept in mind:
1. Don’t wait until you are thirsty to drink water
Thirst is actually a lack of water in the body Signal. As the body loses more water, it will also be accompanied by dark urine, dry skin, chapped mouth and tongue, hoarse voice and general weakness.
Due to the decline of sensory function, the elderly should develop the habit of actively drinking water. It is recommended to drink once every half hour, butDo not drink too much each time, so as to avoid “water intoxication” caused by drinking a lot of water in a short period of time.
2. Do not drink water that is too hot or too cold
Overheated water (over 65°C) will scald the esophageal mucosaIf this happens for a long time, repeated damage-repair of the esophageal mucosa will easily lead to cancer.
Ice water is easy to irritate the gastrointestinal tract, causing abdominal pain, diarrhea and other discomfort. In special circumstances, it may also cause danger, such as: drinking in summerIce water can easily cause residual heat to accumulate in the body, leading to heatstroke; patients with three highs who drink ice water can easily cause coronary artery spasm, induce angina pectoris and even myocardial infarction.
3. Do not substitute fruit juice or beverage
Many people always think that “plain water is too bland and tasteless”, and they like to use fruit juice and drinks instead. However, they contain high sugar content.Excessive drinking can easily increase the risk of obesity, diabetes, gout and other diseases. It is better to drink less.
For example: Some studies have found that the intake of sugary drinks is positively correlated with the risk of gout, and those who drink sugary drinks with hyperuricemia Chance increased by 35%. 
 China Internet Joint Rumor Refutation Platform. “True Knowledge: Can Drinking Soda Water Lower Uric Acid? “.2021-05-13.
 Soraiya Ebrahimpour-koujana, Parvane Saneeib, Bagher Larijanic, et al. Consumption of sugar sweetened Beverages and dietary fructose in relation to risk of gout and hyperuricemia: a systematic review and meta-analysis[J]. Critical reviews in food science and nutrition, 2020 , 60(1):1-10.< /p>
Source: I am the doctor’s official Weibo