Can overnight water cause cancer?

Water is the source of life, water maintains the most basic life activities, 75% of the body is water, so drinking water is very important, but the quality of water is more important. I believe many people have heard that drinking too much water with thousand boiling water and overnight water can cause cancer. In fact, there is no scientific basis for this. What is really harmful to the body is hot water.

Thousands of boiling water and overnight water drink too much to cause cancer?

1. Thousands of boiling water

Thousand boiling water is water that has repeatedly boiled and boiled many times. I believe that many people have heard that the water that has been boiled cannot be boiled to avoid cancer. This is actually a wrong idea. There are indeed a large amount of nitrite and nitrate in tap water. After repeated boiling, part of the nitrate can be converted into nitrite. Nitrite may chemically react with ammonia in the stomach to form ammonium nitrite, which is a first-grade carcinogen, so many people are worried. In fact, toxicity can only be brought about by reaching a certain dose. National standards believe that the content of nitrite in drinking water is less than one milligram per liter. After boiling the water repeatedly for 20 drinks, the content of nitrous acid per liter is 0.038 mg, which means that the water that has been boiled several times can be drunk with confidence and will not cause cancer.

2. Overnight water

In fact, water can be drunk overnight. Many people wonder why the water you drink in the morning can be drunk at night, but the water that is boiled at night cannot be drunk in the early morning of the second day. Some people think that it is caused by too much nitrite. In fact, in the boiling water overnight, the content of nitrite in the water is very low. So overnight water can be drunk, but overnight water must be covered with a lid to prevent dust from entering. What needs to be reminded is that the hot water can be boiled and left for 3 days at most. You can't drink it if it exceeds 3 days.

Can I still drink the water overnight? Meet the three points you can drink

Some people think that overnight water cannot be drunk. There are two main reasons:

Basis 1: When water is exposed to the air, the number of colonies will continue to increase. With the prolonged storage time, the water quality will be contaminated. If you accidentally drink it, the pathogenic bacteria inside may cause disease.

Basis 2: The nitrite content in the overnight water is high, and it will be converted into nitrite amine when it enters the body. This is a carcinogen that may cause poisoning and carcinogenesis.

Are these two statements valid?

invalid!

First of all, water does have a shelf life. Drinking raw water will cause diarrhea, because there are various microorganisms and bacteria in it. But the boiled water was boiled at a high temperature, and the microorganisms and bacteria in it were killed. But if the boiled water cools down, the temperature is very suitable for microorganisms and bacteria to multiply, but there is no fixed time for how long it takes to drink.

Secondly, there is nitrite in the water itself. The content of nitrate in qualified drinking water is very low. Even if it enters the human body, the amount of nitrite is very small, and it is basically not poisoned. Therefore, drinking one or two glasses of overnight water will not reach the poisoned dose.

In summary, whether the water can be drunk overnight has nothing to do with whether it is overnight or not. It mainly depends on whether the following three requirements are met:

1. Water storage environment. After the boiled water, the microorganisms in it have been killed. If it is stored with a lid, it can prevent dust falling and inhibit the re-growth of microorganisms, which can extend the storage time;

2. Water storage appliances. Water storage appliances are also particular. Glass is the best container for water storage. Because of its stable molecular structure and transparent appearance, any abnormalities in the water can be detected in time to avoid accidental drinking. And pay attention to the cleaning of water storage appliances, water bottles that have not been cleaned for a long time will easily deteriorate the water quality;

3. Time. Although the water can still be drunk overnight, it is not possible to drink it indefinitely. It is generally recommended that the boiled water should not be drunk after a maximum of 3 days.

Although overnight water and thousand bouncing water are not harmful to human health, microorganisms are everywhere. Water is not only the source of human life, but also the source of life of various microorganisms. Anything placed for a long time will start to have microorganisms. Reproduce and produce harmful substances. Therefore, while refuting the rumors, I also suggest that you drink the cool white boil as soon as possible.

What kind of water is really harmful to the body?

In fact, it is hot water above 65°C that really causes cancer. Hot drinks above 65°C are called 2A carcinogens. The main reason is temperature, not the drink itself. Because the oral mucosa and esophageal mucosa are extremely sensitive to temperature, the best eating temperature is between 10-40℃, and the temperature that can be tolerated is between 50-60℃. Once it exceeds 65℃, it will burn the mucosa. Occasionally one or two burns, the mouth and esophagus can repair themselves. However, long-term drinking or eating while hot can cause esophageal and oral ulcers and increase the risk of esophageal cancer.

Tips

Don't go into the misunderstanding of drinking water, and develop a good habit of drinking more water. Don't feel thirsty while drinking water. When you feel thirsty, it means that your body is already in a state of dehydration. Drink 100~200ml of water each time, with an interval of 30 minutes. In addition, it is not limited to 8 glasses of water. If you sweat a lot during strenuous exercise, you will lose a lot of water, so you need to increase the amount of water you drink. Patients suffering from heart disease, diabetes and kidney disease should not drink too much water. They should control the amount of water they drink according to the doctor's instructions to avoid increasing the burden on the kidneys and heart.