Can I still drink tea after it has expired? Maybe many people are wrong.


Can I still drink tea after it has expired? Maybe many people are wrong.

Uncle Liu has been obsessed with drinking tea for health recently. He always takes a pot of strong tea with him every time he goes out. Old friends think it is not good to drink too much tea, but he retorts fiercely every time.

"You don’t understand, how many articles and reports on the Internet say that drinking tea is good for your health, can open channels, can treat Alzheimer’s disease, and can improve many diseases."

However, he thought he was healthy, but in the latest physical examination, many values were not up to standard, and he even suffered from kidney disease and gastritis.

On the contrary, other friends’ reports are very healthy, which makes him puzzled. Why do you get so many diseases when you insist on drinking tea for health?


Fudan university research:

Can tea stimulate human meridians?

I believe everyone has heard of the rumor that tea can pass through meridians, but it has always been doubtful whether it is true or false. After all, even the meridians that Chinese medicine has always emphasized are an audible thing to many people, but they have never seen it before. Because it cannot be objectively presented, many people think it is pseudoscience.

However, a research team of Fudan University successfully displayed the meridians through imaging technology by drinking tea. What happened?

Searching the papers about the research team in the journal Quantitative Biology shows that the researchers observed the fever images of the subjects by using twelve kinds of tea, and found highly consistent meridian tropism results. Finally, the meridian model was successfully simulated by using infrared radiation images of human body through the stimulation of tea on specific meridians. Moreover, different kinds of tea will be classified into different meridians.

Systematic image source data map conforming to the traditional description of human meridians

However, there are still many controversies about the results in the industry, and the research has only carried out preliminary experiments, which can not completely confirm the effectiveness.

Some’ discussions’ by netizens have also made these doubts rampant. For example, whether the heat change path used in the experiment excludes other biochemical factors, the sample size is too small, and the variables such as tea temperature are not explained. Therefore, it is still doubtful whether drinking tea can open and stimulate people’s meridians.


Drinking some tea every day has so many benefits!

Although many rumors about drinking tea are hard to distinguish between true and false, what is certain is that the internationally recognized benefits of drinking tea are indeed beneficial to the health.

1. Reduce the risk of cardiovascular disease.

The European Journal of Preventive Cardiology has published a research paper on the relationship between drinking tea and reducing the risk of cardiovascular and cerebrovascular events and all-cause death. According to the research, people who have tea drinking habits have higher health indicators, pointing out that drinking tea has a certain effect on reducing the rate of cardiovascular diseases.

Image from the network

2. Reduce the risk of diabetes.

The American Journal of Clinical Nutrition also published a study on the relationship between drinking tea and chronic diseases in China. According to the experimental data, the risk of type 2 diabetes, all-cause death and microvascular complications of people who drink green tea every day are reduced by 8%, 10% and 12% respectively. It shows that drinking tea is of great significance to prevent type 2 diabetes and the risk of all-cause death.

3, help to resist oxidation

This is because tea polyphenols in tea itself have antioxidant effect, and the antioxidant effect is 18 times higher than that of vitamin E.

4, refreshing, diuretic fatigue

Tea also contains caffeine, so some people will feel excited and can’t sleep after drinking tea. Therefore, drinking tea also has the effect of refreshing the brain. In addition, these substances will stimulate the kidneys and have the effect of diuresis. Caffeine can also eliminate excessive lactic acid in urine, so it also has the effect of relieving fatigue.

Although tea is good, we should also abide by the principle of moderation, otherwise excessive drinking of tea will also lead to caffeine poisoning or other adverse reactions. In addition, it needs to be emphasized that tea does not belong to the category of drugs, and it has no effect of curing all diseases. Therefore, if you feel unwell, it is recommended to seek medical treatment in time.


Three misunderstandings about tea,

Don’t be fooled.

With the expansion of the demand for tea and the profit-seeking market, many "rumors" about tea have been heard all the time. How many misunderstandings do you believe?

1. Tea is full of pesticides.

There are rumors that non-organic teas are all grown up by spraying pesticides, and there are many pesticides left in the tea. However, in fact, the regulations on the use of food pesticides stipulated by the state are very strict. Generally, the tea that is listed in compliance has undergone strict sampling inspection and will not be "all pesticides".

2. You can’t drink tea when it expires.

This actually depends on the situation, because after the tea is dried, if it is properly preserved, even if it exceeds the shelf life, it can actually continue to drink, with little impact. If the tea leaves get wet, deteriorate, change color obviously, and smell, you should never continue drinking even if the shelf life has not expired.

3. Green tea is cold and black tea is warm

In fact, green tea and black tea are the same kind of fresh tea. As a result of different production processes, the general factory will make the fresh leaves fail by oxidation at high temperature, so as to prevent "tea polyphenols from discoloring", that is, "deactivating enzymes" in jargon, while black tea is the opposite, so that tea polyphenols can be fully oxidized and discolored, thus obtaining the flavor of black tea. As for which "warm" and "cold" is actually just a statement of packaging needs.


How to drink tea is more beneficial to health?

In fact, there is a lot of knowledge in drinking tea. If you want to give full play to the greatest role of tea, you should be particular when drinking it!

1, the brewing temperature is appropriate.

Different teas also have different brewing temperatures. For example, green tea is suitable for brewing with water around 80℃, while black tea and oolong tea need boiling water to fully separate out their own flavor.

2. Let the tea cool before drinking.

Many people like to make tea with hot water and immediately pour it out "while it is hot", but hot tea is very harmful to esophageal health, and even increases the risk of esophageal cancer. The International Agency for Research on Cancer also recommends not to drink hot drinks over 65℃, so it is better to let the tea warm before drinking.

3. Drink more light tea and less strong tea.

The concentration of caffeine in strong tea is higher. If taken too much, it will lead to insomnia, and it will also increase the burden on the kidneys, stimulate the stomach and deepen the symptoms of anemia. It is suggested that the amount of tea leaves should be controlled within 12 grams per day. Generally, 3 grams of tea leaves are soaked in 150ml of water, and 3 cups a day is enough.

If you want to drink tea well, in addition to mastering the above best tea drinking methods, you should also pay attention to the taboos when drinking tea, such as not drinking tea on an empty stomach and not drinking tea after drinking, so as to drink healthy.


[1] "Drinking more tea is not as good as drinking tea for health, so we should pay attention to seven taboos". People’s Daily Online .2016-03-09.

[2] "Drinking tea every day, what will happen to your body? Can lower blood pressure and blood sugar, and reduce the risk of death? China. 2023-07-03.

[3] "More and more studies have proved that drinking tea has so many benefits! Health Times. 2022-08-29.

Reprinting is prohibited without the permission and authorization of the author.

Read the original text


admin administrator