Does overnight tea cause cancer? Can I drink tea overnight?

I believe you all know about the problem of overnight tea. It's estimated that the most frequently heard is that overnight tea can't be drunk. If you drink it, it will cause cancer. But is there any scientific basis for this statement? Let's discuss it with you today.

In human food, there are many substances containing nitrates or nitrites. If people eat them, they can synthesize nitrosamines with secondary amines in human body, and nitrosamines have the trend of carcinogenesis under the unique environmental metabolism in vivo. Because of the discovery that the overnight tea contains nitrite, some people panic and think that drinking the overnight tea will lead to cancer. This fear is actually superfluous. In fact, nitrite itself is not carcinogenic, it needs certain conditions to have carcinogenic effect, that is, there are secondary amines in the body and they are synthesized into nitrosamines. However, polyphenols and vitamin C in tea can inhibit the synthesis of nitrosamines, and not all overnight teas contain nitrite. Even if there are some overnight teas, their content is very small. Therefore, there is not enough scientific basis for the claim that drinking tea overnight will lead to cancer. There is nitrite in tea, but compared with other foods, such as fish, meat and vegetables, it's nothing. If drinking tea overnight can cause cancer, then eating fish, meat and vegetables overnight will cause cancer. However, no such cases have been seen so far.

Professor Zhang, a famous tea expert in China, from the Department of tea science of Zhejiang Agricultural University, specializes in making a cup of tea in the evening and drinking it in the morning the next day. It's like a day for decades, and the body is still healthy. From this point of view, the argument of overnight tea carcinogenesis can not be established from theory to practice. It's not about people drinking tea overnight. Any food is fresh, tea is no exception. Tea is not only fragrant, but also nutritious. It can reduce the chance of contamination. Especially in the high incidence season of intestinal infectious diseases, drinking tea soup overnight will facilitate the spread of pathogenic bacteria. Therefore, it's better to brew tea now rather than drink it overnight.

In recent years, studies have found that overnight tea, if used properly, has many benefits.

1. Hemostasis. Overnight tea can prevent capillary bleeding, such as stomatitis, Glossalgia, eczema, gum bleeding, etc. can be treated with overnight tea.

2. Clear eyes. Eyes appear conjunctival congestion or often tears, every day with overnight tea wash eyes many times, can work.

3. Fresh breath. Every morning before or after brushing your teeth, gargle a few overnight teas to refresh your breath and strengthen your teeth.

4. Protect hair. Overnight tea can be used to wash your hair, because it can stop itching, generate hair and remove dandruff.