As the saying goes, "people take food as the sky, food takes water first", and maintaining sufficient water intake every day plays a vital role in human skin, blood vessels, intestinal health, etc.
◎Maintain good skin: sufficient skin moisture, fast metabolism, not easy to grow wrinkles, stains, etc., more youthful;
◎Reduce respiratory diseases: the respiratory mucosa is relatively moist, and the mucus secreted helps to reduce the invasion of germs;
◎ Smoother blood flow: sufficient water is sufficient to help the blood run smoothly, and the risk of blood clots is relatively lower;
◎Prevention of constipation: Sufficient water can prevent dry stool and prevent constipation...
But about drinking water, there have been many remarks in life, such as: boiled water can not be drunk for more than 16 hours, long-term drinking of water with scale is easy to get kidney stones, drinking soda water can lower uric acid... Are these claims true or false? Today, Xiao Er will take you to find out.
Plain water also has a "shelf life"
Can't drink it for more than 16 hours?
It is said that boiled water also has a "shelf life", more than 16 hours, E. coli will breed in large quantities, resulting in abdominal pain, diarrhea, fever and nausea, can not drink?
In fact, there is no scientific basis for this claim, as E. coli does not spread through the air. In this regard, researchers at Fuzhou University made a special experiment:
experiment
The researchers placed boiled water in two groups, capped and uncapped 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 showed that whether it was covered or uncovered, after reaching the experimental time, the boiled water placed in each water cup did not have E. coli.
However, E. coli can contaminate water sources through feces, so it is best not to drink raw water that has not been sterilized.
In addition, the summer temperature is high, the humidity is high, if not stored properly, the long-term water may be contaminated by flies, dust, etc., may also contain other bacteria, it is best not to drink, especially children or people with fragile stomachs.
Drink water with scale for a long time
Easy to get kidney stones?
Observing the kettle at home, you can find that the bottom of the pot often has a layer of white scale, there are rumors that "this is hard water, drinking too much is easy to get kidney stones", is this really the case?
In fact, scale is mostly formed because water contains more calcium and magnesium ions.
The mainland's "Sanitary Standards for Drinking Water" stipulates that the total hardness of drinking water (in terms of calcium carbonate) does not exceed 450mg/L, which is equivalent to 180mg of calcium in 1L. Adults usually drink no more than 2L of water per day, plus the reference daily intake of calcium is 800mg, and the maximum tolerable intake is 2000mg.
It can be seen that normal drinking water will not cause excessive calcium in the body, let alone induce kidney stones.
Secondly, drinking more water can dilute the concentration of calcium oxalate and calcium urate, but help prevent the formation of kidney stones and even expel small stones that already exist.
Drink plenty of soda
Can regulate acid-base constitution and lower uric acid?
Soda, that is, water containing sodium bicarbonate, is weakly alkaline. It is rumored that drinking it regularly can change the internal environment of the body, correct the acidic constitution, and reduce the risk of disease; It is also rumored to lower uric acid. What are the facts?
01
The acid-base constitution is a lie, and the internal environment cannot be easily changed
First of all, "acid-base constitution" is simply a lie, and there is no such thing as diet and drinking can regulate physical fitness.
What's more, the human body has a complete fluid regulation system, which can stabilize the pH value of the internal environment between 7.35-7.45, which cannot be changed by food and drinking.
Therefore, for the general population, there is no need to deliberately pursue weak alkaline water, maintaining good living and eating habits can maintain the acid-base balance of body fluids and fuel health.
02
It can be a little difficult to rely solely on soda to lower uric acid
Theoretically, soda can alkalize urine, increase uric acid solubility, and promote uric acid excretion.
But you can't reduce uric acid simply by drinking soda, because the soda sold on the market, the sodium bicarbonate content is almost negligible, it is difficult to change the urine pH, let alone lower uric acid.
Of course, for patients with high uric acid, it is not harmful to drink some soda, after all, drinking more water can promote uric acid excretion.
Drink more lemonade whitening?
The effect is limited, and drinking the wrong one also hurts the body
"One white covers all ugliness", summer whitening work is even more inexorable. Among the various whitening methods, fresh and delicious lemonade is especially sought after. But can drinking lemonade really whiten?
01
Drink lemonade for whitening, which has limited effect
It is believed that lemon is rich in vitamin C, which can reduce skin melanin and have a certain whitening effect.
Indeed, vitamin C can inhibit the activity of tyrosinase, reduce the production of melanin from the root, and also lighten melanin, which has the effect of brightening skin tone.
But it is unscientific to talk about efficacy regardless of dosage. The vitamin C content of lemon is about 22mg/100 grams, which is not very high, so it is difficult to play a whitening role by drinking a few pieces of lemon water every day.
02
Drinking too much or upsetting the stomach
Since a few slices of lemon soaked water are useless, can I soak a few more and drink more every day?
In fact, blindly drinking too much is not good - lemons are rich in fruit acid, citric acid, malic acid, etc., too much intake will stimulate the gastric mucosa, causing stomach discomfort, especially people who have basic diseases such as gastritis and gastric ulcers should be more careful.
In general, if you want to whiten, it is better to honestly do a good job of sun protection, and ensure that the intake of 300~500g of vegetables and 200~350g of fruits per day is more reliable. You can also buy skin care products containing niacinamide, arbutin, vitamin C and other ingredients.
To drink 8 glasses of water a day?
This amount is enough, but there are differences between different groups of people
The saying "drink 8 glasses of water a day" is widely circulated, and many people insist on doing so. But have you ever wondered how big a cup these 8 cups of water should be used? It is clear that this statement is not very accurate.
So how much is the right amount to drink per day? Is this standard suitable for everyone?
01
Drinking water every day, this standard is enough
The Dietary Guidelines for Chinese Residents (2022) states that adult men with low physical activity levels should drink 1700ml per day, and adult women should drink 1500ml per day.
If the weather is hot, the air is dry, sweating is excessive, etc., it is necessary to appropriately increase the water intake according to the actual situation. You can pay attention to your urine, if the color is light yellow, clear and sufficient, it means that the water intake is basically sufficient.
02
These groups of people need to control their water intake
The above drinking water standards are for healthy people, while some special groups are treated differently, such as:
◎ Patients who are taking medicine to treat gastric ulcers: the drug contains sucralfate and aluminum hydroxide gel and other substances, which will protect the gastric mucosa, if you drink too much water, it may reduce the efficacy and is not conducive to the recovery of the condition.
◎ Patients with chronic kidney disease: When the kidney function is impaired, the water drunk cannot be excreted normally outside the body, so it is necessary to control the amount of water intake. Generally, the appropriate amount of water throughout the day (including drinking water and drinking water) = 500ml + the amount of urine the day before;
◎ Patients with heart failure: drinking a large amount of water will cause an increase in the amount of blood returning to the heart, thereby increasing the workload of the heart and aggravating the condition. For severe heart failure, water intake even needs to be controlled within 800ml.
【Note】The specific amount of water intake is subject to the doctor's recommendation.
Remember "3 Don'ts"
Master the correct way to open water
Drinking water may seem simple, but many people do it wrong. According to the "China Water and Quality of Life Awareness Survey Report", 95.3% of people on the mainland cannot drink water. Drink water correctly, and remember the following 3 points.
01
Don't wait until you're thirsty to drink water
Thirst is actually a sign of a significant lack of water in the body. As the body's water loss increases, it is accompanied by darkening urine, dry skin, chapped mouth and tongue, hoarseness, and general weakness.
Due to the decline in perception function, the elderly should develop the habit of actively drinking water. It is recommended to drink it every half an hour, but do not drink too much each time to avoid "water poisoning" caused by drinking a large amount of water in the short term.
02
Do not drink excessively hot, cold water
Overheated water (more than 65 ° C) will scald the esophageal mucosa, and in the long term, the esophageal mucosa is repeatedly damaged-repaired, which is easy to cause cancer.
Ice water is easy to irritate the gastrointestinal tract, causing abdominal pain, diarrhea and other discomfort. Under special circumstances, it may also cause dangers, such as: drinking ice water in summer can easily cause residual heat accumulation in the body, resulting in heat stroke; Three high patients drink ice water, easy to cause coronary artery spasm, induce angina pectoris and even myocardial infarction.
03
Do not substitute with juice or beverage
With the arrival of summer, fruit juices and drinks are often popular, but they have a high sugar content, and excessive drinking is easy to increase the risk of obesity, diabetes, gout and other diseases, so it is better to drink less. For example, studies have found that the intake of sugary drinks is positively correlated with the risk of gout, and the risk of hyperuricemia from drinking sugary drinks increases by 35%.
If you really don't want to drink boiled water, you can add some tea, roses, chrysanthemums, dendrobium, goji berries, etc., which are delicious and healthy.
Source: CCTV Home for Dinner