Thousand boiling water, overnight water does not cause cancer! It is actually these 2 kinds of water that may cause cancer

If you open the circle of friends of a middle-aged or old friend, you will find all kinds of articles and contents about health preservation!

In particular, health knowledge related to cancer can attract more attention, because we are too "afraid" of cancer!

Cancer has many characteristics, such as malignant, difficult to treat, high cost of treatment, high mortality and so on. In addition, some websites and articles in order to win the click-through rate, but also opened up a made-up, no scientific basis for cancer prevention!

But some people really believe in cancer prevention knowledge without scientific basis.

For example: overnight water, thousand boiling water can not drink, otherwise it will cause cancer, this is one of the most common cancer prevention rumors in life!

Overnight water, thousand boiling water does not cause cancer at all!

At first glance, they are all based on nitrite.

Health practitioners believe that after a long time repeatedly boiling water, overnight water, will produce a lot of nitrite. After entering the body, this substance reacts with gastric acid and protein to form nitroso compounds, a class of carcinogens, nitrosamines, and eventually leads to cancer. A sip is the source of all evil.

To talk directly about toxicity beyond dosage is to play a hooligan

First of all, there are different concentrations of nitrite in natural water. For example, the content of nitrite in tap water is about 10mg, that in underground water is about 20mg, and that in mineral water is about 45mg.

Under normal circumstances, nitrite want to reach carcinogenic dose, if it is mineral water, at least one-time drinking 4400 ml. Under normal circumstances, our daily water consumption is only about 1500-2000ml. Our daily drinking tap water, mineral water, are fully in line with the national drinking standards, and will not cause harm to the body!

Moreover, even after repeated boiling of water, nitrite content is also quite low, can not reach the carcinogenic or toxic dose.

Even studies have shown that 1 liter of water after repeated boiling, the nitrite content is not as much as you eat a ham sausage, so thousands of boiling water carcinogenic, this is a rumor.

The content of nitrite in overnight water exceeds the standard, which is even more ridiculous

Boiled water in the morning can also be drunk in the afternoon. And the water placed at the same time, but only at night, this kind of water can not be drunk?

However, if the water is kept for a long time, and the cup is not covered, there are a lot of microorganisms, dust fall, this situation is not suitable for drinking again, but it has nothing to do with cancer!

Although thousand boiling water and overnight water do not cause cancer, there are two kinds of water that may increase the carcinogenicity of the body. We should try our best to avoid drinking them in our daily life:

1. Hot water

There is a close relationship between scalding food and digestive tract cancer, because there are mucous membranes on the surface of human esophagus and stomach. These mucous membranes are delicate and fragile, and their tolerance to temperature is quite limited. Only when the temperature is about 40 ~ 50 ℃ or above 65 ℃, it can cause scalding on the surface of mucous membrane.

Although the mucosa has the ability of self-healing, it can develop into intestinal metaplasia and atypical hyperplasia under repeated damage, thus increasing the possibility of canceration.

2. Sugary drinks

Sugary drinks do not directly cause cancer, but long-term large intake will cause obesity. Drinks containing fructose can also promote the production of more purine components in the body, which can induce hyperuricemia and obesity.

Obesity is closely related to some cancers, including breast cancer, colorectal cancer and so on.

The carcinogenicity of any carcinogen is not absolute, it is only possible to cause cancer.

After all, the emergence of cancer is a complex process, which also involves genes, age, immune function and many other aspects.

Therefore, we should take a rational view of cancer and carcinogenic factors, away from carcinogenic factors is to reduce the risk of cancer.