5 major drinking misunderstandings of boiled water

Maintaining adequate water intake every day plays a vital role
in human skin, blood vessels, intestinal health, etc.
But about drinking water, there have been many sayings 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 can lower uric acid.
.
.
Are these claims true or false?

Plain water also has a "shelf life"

Can't drink it for more than 16 hours?

Some people say 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 specially did an experiment: the researchers placed open water for 5 hours, 8 hours, 11 hours, 14 hours, 15 hours, 16 hours and 17 hours respectively, 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, in summer, the temperature is high, the humidity is high, if stored improperly, the water that has been put for a long time may be contaminated by flies, dust, etc.
, and may also contain other bacteria, it is best not to drink, especially minors or people
with weak gastrointestinal function.

Drink water with scale for a long time

Easy to get kidney stones?

After using the kettle at home for a period of time, the bottom of the pot often has a layer of white scale, and 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
.
China's "Drinking Water Hygiene Standards" stipulates that the total hardness of drinking water (based on calcium carbonate) does not exceed 450mg/L, which is equivalent to 1L containing 180mg of calcium
.
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 body's internal environment, correct acidic constitution, and reduce the risk of
disease.
There are also rumors that it can lower uric acid
.
What are the facts?

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 saying that
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, and it is impossible to change
it through food and drinking.
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.

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
.
For patients with high uric acid, it is not harmful to drink some soda properly, 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

There is a saying called "one white covers all ugliness", among the various whitening methods, fresh and delicious lemonade is especially sought after
.
But can drinking lemonade really whiten?

Drink lemon water whitening, 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 at the root, and also dilute melanin
.
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, so it is difficult to play a whitening role by drinking a few pieces of lemon water every day
.

Drink too much, or cause stomach upset Since a few pieces of lemon soaked water are useless, is it okay to soak a few more tablets 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 ulcer 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 300-500g of vegetables and 200-350g of fruits per day are 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?

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?

There is a standard for daily water intake 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
.

These groups should control water intake The above drinking standards are for healthy people, and some special groups should be treated differently, such as patients who are taking medicine to treat gastric ulcers, drugs containing 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 disease; In patients with chronic kidney disease, when renal function is impaired, the water they drink cannot be excreted normally outside the body, so it is necessary to control 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; Drinking a lot of water in patients with heart failure will cause an increase in the amount of blood returning to the heart, thereby increasing the workload on the heart and aggravating the condition
.
In severe heart failure, water intake even needs to be controlled within
800mL.

It is worth mentioning that due to the different basic constitutions, the amount of drinking of various types of patients should first be subject to the doctor's advice
.

Remember the three don't

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 Cognition Survey Report", 95.
3% of people in China cannot drink water
.
To drink water correctly, the following 3 points should be remembered:

Don't wait until you're thirsty to drink water Thirst, in fact, is a sign
that the body is obviously short of water.
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 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.

Do not drink too hot and cold water Overheated water (more than 65 ° C) will burn the esophageal mucosa, long-term so, esophageal mucosa repeated damage, repair, 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 is easy to 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
.

Don't replace it with juice and drinks Many people always feel that "boiled water is too weak and has no taste", and like to replace it with juice and drinks
.
However, these drinks are usually high in sugar, and excessive drinking can easily 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 sugar-sweetened beverages is positively correlated with the risk of gout, and the probability of drinking sugar-sweetened beverages to suffer from hyperuricemia increases by 35%.

(Source: I'm a big doctor)

China Food News(Version 07, December 05, 2022)

(Responsible editor: Luo Chen)