Is there any harm in drinking tea overnight?

Many people feel that overnight tea cannot be drunk, and there are many theories, among which the more "alarmist" is that drinking overnight tea will cause cancer, but in fact, this statement has no scientific basis.

1.The concept of overnight tea is difficult to distinguish.

Tea brewed in the morning is very common to drink in the afternoon, tea made in the middle of the night, drunk after getting up early in the morning, the changes in the tea will not be greater than during the day, if you have to say that there is any difference, but the temperature during the day is high, the tea change may be greater.

2.If the tea is left out for a long time, what will happen?

Studies have shown that the main change is the further oxidation of tea polyphenols, which darkens the color. A cup of clear and turquoise tea, especially if left for a long time in high temperatures, will lose its green color and increase the degree of yellowness. This is the oxidation product of the oxidation of tea polyphenols in tea to form yellow-red and reddish-brown, mainly theaflavin, thearubigin, theabrownin, etc.

These products are non-toxic and do not cause harm to the human body.

3.It has also been speculated that when tea is left overnight, nitrosamines, a carcinogen, are produced.

It should be affirmed that even if there are nitrosamines in tea, they are insignificant, and many foods we eat daily, such as bread, vegetables, pickles, salted fish, salted meat, etc., contain nitrosamines, and the amount is much more than that in tea. But I didn't see that everyone stopped eating. Isn't it terrible to have a nitrosamine content of 4 50 micrograms per kilogram of meat products, but in fact it is not, because the human body itself has the function of breaking down nitrosamines.

In addition, studies have shown that tea is rich in tea polyphenols and vitamin C, which are natural inhibitors of nitrosamines. Therefore, drinking tea can also eliminate the harm caused by other foods containing nitrosamines. Tea is rich in tea polyphenols, which inhibit lipid peroxidation by scavenging oxygen free radicals, and the inhibitory effect on other carcinogens is also quite obvious.

Vitamin C and vitamin E in tea also have anti-cancer effects.

Overnight tea has lost most of its vitamins due to a long time, and the proteins and sugars in the tea soup will become nutrients for bacteria and molds to multiply, so people usually think that overnight tea cannot be drunk. In fact, overnight tea that has not deteriorated can not only be drunk, but also has the following health care effects: anti-cancer, anti-oxidation, hemostasis, eyesight, itching, hair growth, tooth fixing and tooth cleaning, bad breath, sunscreen, fishy and greasy removal.

When using overnight tea, it should be done in a way that does not spoil (spoils). The temperature is high in summer, and the tea is easy to rancidity, if it is left for more than 24 hours, it is best not to drink it, otherwise it will cause diarrhea.

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Overnight tea can harm gastrointestinal health, induce stones, cause cancer in the body, and affect digestive function, which are all harms of drinking overnight tea.

Overnight tea is a relatively long brewed tea, this physique tea is deteriorated, easy to breed some bacteria, will harm human health, in addition to overnight tea will also produce a large amount of tannic acid, this substance and oxalic acid in other foods will produce substances that are not good for the human body, will also harm human health, easy to make stones high, so usually drink tea as soon as possible after brewing, do not drink overnight tea.

1. Endangering gastrointestinal health.

Overnight tea will endanger human gastrointestinal health, because overnight tea is stored for a long time, easy to breed mold and a variety of germs, people drink this health tea after the state of mold and bacteria into the body, easy to endanger intestinal health, intestinal inflammation, but also let people have abdominal pain and diarrhea and other uncomfortable symptoms, human gastrointestinal function will be seriously impaired, can not digest other food normally.

Second, let the incidence of stones be high.

Inducing stones is also the main harm of drinking overnight tea, because overnight tea contains a large amount of tannic acid, people will absorb sulfuric acid after drinking overnight tea, it will react with oxalic acid in other foods, and produce some substances that the human body cannot digest and absorb, this substance will produce stones after accumulation in the body, which will make gallstones and urinary tract stones high, and the health of the body will be seriously damaged.

3. Cause cancer in the human body.

People drink overnight tea and lead to subdivision cancer, because lotus leaf tea will produce some carcinogenic ingredients in the process of soaking for a long time, and the human body will cause cells to become cancerous after absorbing these substances, so that the incidence of cancer is high, which is not good for health, and some heavy metals will be produced in overnight tea, which will also endanger human health after they enter the human body, and will make some blood diseases appear. Overnight tea is harmful to the human body, and there are many harms, but this is for those spoiled overnight tea, if the tea soup is overnight but not spoiled, it can still be drunk and there is no obvious harm, but at this time, the nutrients in the tea soup have been lost a lot, and drinking it again will not have a good health effect.