The normal functioning of the human body is inseparable from water.
However, there are also rumors that thousands of boiling water can cause cancer, and overnight water is toxic and cannot be drunk.
Is this true?
Thousands of boiling water, overnight water is harmful to health?
According to rumors, after boiling water many times or leaving it overnight, the nitrite content in it will increase significantly. After nitrite enters the human body, it will generate carcinogenic nitrosamines under the action of gastric juice.
In order to verify the scientific nature of this statement, the experimenters deliberately conducted an experiment.
They turned tap water into three samples, boiled them 1, 5 times, and 10 times, and left them for a period of time to test the nitrite content. The detection time is 0 hours, 24 hours, and 48 hours after placement, respectively.
The experimental results show that the more the water is boiled, the higher the nitrite content in it. Moreover, water after 48 hours did contain more nitrite compared to water that had been left for a shorter time.
However, the highest nitrite content detected in the experimental samples was 0.014mg/L, which was far lower than the national safety standard of 1mg/L.
That is to say, whether it is the so-called thousand boiling water, or overnight water, it will not have much impact on human health, let alone toxic and carcinogenic.
These 3 misunderstandings of drinking water, have you been hit?
First, drink plenty of water after a cold to get better quickly
When people have a cold, they tend to have symptoms of fever.
And fever will cause a lot of water loss from the body.
Therefore, some people think that you should drink more water to replace the lost water, so that you can get better faster.
Actually, the truth of the matter is exactly the opposite.
If we just replenish water in large quantities, it will not make the body recover faster, but may trigger dehydration.
In fact, this is mainly because when people have a cold and fever, they not only lose a lot of water, but also lose a lot of electrolytes (sodium, potassium, etc.) in the body.
In this case, if you only replenish a lot of water without replenishing electrolytes in time, it will further dilute the electrolyte concentration in the body. In order to maintain the balance of electrolyte concentration, the body may expel "excess" water, which in turn triggers a dehydration reaction.
Second, often drink pure water, the body will lack minerals
We all know that compared with untreated tap water and mineral water, the mineral content in pure water is relatively low.
Therefore, it is rumored that drinking pure water regularly can lead to a lack of minerals in the body.
In fact, the mineral content in the water is not high.
There is little difference in the mineral content between mineral water and pure water.
Even if you drink pure water often, it will not have much impact on the body.
Third, drinking weakly alkaline water is healthier
The so-called weakly alkaline water refers to water with a pH value of slightly greater than 7.
Many people think that drinking weak alkaline water can change the pH value of the body and make the body healthier.
In fact, there is no scientific basis for this idea.
Under normal circumstances, the PH value of the human body will be maintained at about 7.35-7.45.
The pH of weakly alkaline water is similar to that of the human body.
Therefore, it does not cause significant changes in the pH of the human body.
Moreover, the weakly alkaline water we drink cannot be absorbed by the human body.
Therefore, there is no need to buy weak alkaline water to drink, common boiled water, pure water is enough to meet the needs of the human body.
Drink water correctly and keep these 3 points in mind
First, do not drink too hot water
Some people like to drink hot water and think that this is good for the body.
As everyone knows, excessive hot water may burn the esophageal mucosa.
Therefore, it is not recommended that everyone drink water that is too hot.
Generally speaking, water around 35°C-40°C is more suitable for drinking.
Because this temperature range is relatively close to the temperature of the human body, it will not burn the fragile mucosa due to excessive heating, nor will it bring greater stimulation to the human body due to excessive cooling.
Second, don't wait until you are thirsty before drinking water
In real life, many people think that thirst is a sign of lack of water in the body, and you don't need to drink if you are not thirsty.
In fact, only when the body reaches the level of severe water shortage, will it prompt us to drink water through signals such as thirst.
At this time, it is a little late to drink water.
Therefore, it is recommended that everyone rehydrate in time according to the changes in the specific situation.
Third, don't drink too much water in one go
Some people have the habit of either not drinking water or drinking a lot of water at once.
The human body ingests a large amount of water in a short period of time, which will inevitably bring a greater burden to the stomach.
Therefore, it is best to appropriately increase the frequency of drinking water, while reducing the amount of water we drink each time.
(Source: Consumer Health Online)