Friday, June 26, 2020

Drinking these 3 kinds of tea will cause cancer

We Chinese love to drink tea, and our tea culture has a long history. According to many people's research on tea, the benefits of drinking tea are really very much. Men drinking tea can lower blood pressure and blood pressure. Women drinking tea every day not only helps to lose weight, but also has beauty effects. But did you know that drinking tea is not good for casual drinking, and some improper ways of drinking tea may even cause cancer risk.

1. Drink hot tea-cause esophageal cancer, oral cancer

People who like hot food are vulnerable to the mouth and esophagus. If the esophagus is stimulated by hot food or tea for a long time, the chance of mutation of the esophageal epithelial cells will be greatly increased, and esophageal cancer is more likely to occur. The same is true for the oral cavity.

Professor Chen Jiyue of the Department of Oncology, Cancer Center, Southern Medical University Hospital of Integrated Traditional Chinese and Western Medicine said that people who regularly drink hot tea will also get esophageal cancer, not because of the quality of the tea, but because of the temperature of the tea when drinking it. Generally, people who like to drink tea like to drink hot, so as to taste the taste and characteristics of tea, but often ignore the issue of whether it is too hot and whether the temperature is suitable for drinking.

The correct way: Once the temperature of the tea exceeds 70 degrees, the chance of esophageal cancer will increase by 8 times. The most suitable temperature for drinking tea is around 55-60 degrees. If you feel it is too hot, you must spit it out immediately, and don’t swallow it to burn the esophagus.

Second, drink overnight tea-lack of nutrition, increased carcinogens

The so-called inability to drink overnight tea is not a tea that has been left overnight, but it may be unhealthy for health if the tea leaves are brewed for too long. If the tea leaves are left for too long, nutrients such as protein and sugar in the tea water will easily multiply bacteria and mold, and nutrients such as vitamins will also be easily lost. In addition, the tannic acid in the tea leaves is easy to stimulate the stomach. Drinking tea for a long time because of saving will not only increase the nutrition, but also be harmful to the body.

The correct way: Once the tea has been brewed, it should be drunk as soon as possible after dropping to a suitable temperature, and it should not be left for more than two days. Especially after multiple brewing, not only the nutrients in the tea are gone, but also harmful carcinogens.

3. Drink strong tea-easy to cause stomach cancer

Some people have the habit of drinking strong tea after a drink, but this is actually very bad. The strongest irritating substances in strong tea are tannic acid, caffeine and theophylline. If you drink strong tea for a long time, these substances will stimulate the gastric mucosa and easily lead to gastric ulcers. And people who have a bad stomach often drink strong tea, which is even worse. People who have stomach ulcers all year round are more likely to have stomach cancer. Not only that, the caffeine in tea can cause headaches and rapid heartbeat, affect sleep and heart, which is very unfavorable for some people with cardiovascular diseases such as coronary heart disease and atrial fibrillation.

The correct way: a cup of tea is best to use 3-4 grams of tea, especially at night, people with a bad spleen and stomach, and people with a bad heart should not drink strong tea. Once you experience discomfort when drinking strong tea, you can drink warm water and eat sugar to relieve it.

We have heard the saying that tea cannot be consumed overnight. Why do you say that? The main reason given by some people is that overnight tea contains nitrite, which can cause cancer. Generally speaking, the tea soup obtained after brewing tea contains traces of nitrite. With the prolongation of the storage time, especially under the condition of no closed storage, the content of nitrite in the tea soup will continue to rise. This may be the result of a large number of microbial growth and reproduction.

However, the study found that the content of nitrate in Chalia overnight is not much, far below the limit of 1 mg/L in the "Sanitary Standards for Drinking Water" (GB5749-2006). E.g:

In 2006, a study published in "Anhui Agricultural Science" showed that after 24 hours of tea, the content of nitrite reached 2.17 times the initial value, which was 0.130 mg/L.

In 2014, another study on the change of nitrite content in Pu'er tea soup showed that the content of nitrite reached its maximum value after being stored at 25°C for 60 hours under open conditions, which was 2.061 times the initial value, but Only 0.251 mg/L.

Although nitrite itself has certain toxicity, nitrite is not a carcinogen. It is the carcinogen that is generated by the reaction of protein decomposition products under the action of stomach acid. Nitrosamine is recognized as a Class 2A carcinogen by the International Agency for Research on Cancer, which means that humans may be carcinogens.

In other words, the content of nitrite in the overnight tea is within the safe range, even if we drink some, we do not need to worry too much about its carcinogenic problems. However, we discourage frequent drinking, especially those overnight teas that cannot be kept in a sealed and refrigerated storage, because such tea is very susceptible to contamination by pathogenic bacteria and dust, and drinking is harmful to health.

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