China has a unique "tea culture" since ancient times, tea culture has a long history, in many cultural systems in the world, China's "tea culture" has been concerned by the people of the world, deeply loved by people.
Tea is not only a cultural inheritance, but also a manifestation of a way of life.
In addition to being used as a drink, tea is often the best choice to promote good health.
However, a recent study on tea at Peking University has attracted widespread attention and heated discussions, which not only breaks people's previous perceptions, but also brings a trace of worry to the majority of tea lovers.
The study believes that consuming more than 4 grams of tea per day may increase the risk of stomach cancer by 46%!
The results of this study undoubtedly shocked many tea lovers, and they felt incredible, and many people also made a mistake in their hearts: after drinking tea for so many years, will there really be a risk of stomach cancer?
So, what kind of secret is hidden behind the seemingly simple act of drinking tea?
Is drinking tea healthy or harmful? Let's find out.
1. Drinking too much tea can cause stomach cancer?
Many people have the habit of drinking tea in their daily life, especially for most of the middle-aged and elderly people and female friends.
Drinking tea can not only maintain health, but also nourish the skin, and even doctors will recommend some tea leaves with relevant effects for patients to drink when they see patients.
A report by Professor Li Liming's team at the School of Public Health of Peking University in foreign newspapers and periodicals gave a conclusion that is completely opposite to "drinking tea is good for health", which has attracted widespread attention.
The study, which included 500,000 Chinese adults, found that consuming more than 4 grams of tea per day may put individuals at higher risk of stomach cancer, and that increase by as much as 46 percent.
The results of the study showed that individuals who drank more than 4 grams of tea per day had a 26% increased overall risk of cancer, especially lung cancer and stomach cancer by 62% and 30%, respectively.
This result is not only incredible, but also questioned by many medical experts.
Despite rigorous data analysis, the researchers found a hidden flaw in the study.
They speculated that while a sufficient number of random samples had been selected previously, perhaps there were other similarities among most of these samples.
Like most people who work out have the habit of supplementing their diet with a lot of protein, people who drink a lot of tea for a long time may also have varying degrees of correlation with a certain habit.
These correlations cannot be ignored, as they can greatly affect the reliability of the findings.
With this in mind, the researchers followed up with another study to prove whether their hypothesis was valid.
After reintegrating the data, the researchers found that most people with long-term tea drinking habits also had smoking and drinking habits.
And the real cause of lung cancer and stomach cancer is not tea, but these two underlying habits.
In the end, experts came to the conclusion that as long as it is not inferior tea, normal tea consumption will not cause stomach cancer.
However, drinking too much tea should not be excessive, because excessive tea consumption does have the possibility of causing gastrointestinal disorders.
People with a bad stomach can drink tea, but it should be noted that it is not recommended to drink strong tea, mainly because the osmotic pressure of strong tea can cause certain damage to the mucosal cells of the stomach wall.
In addition, people with a bad stomach should also pay attention to the use of fresh tea leaves when drinking tea.
Do not drink spoiled, moldy tea leaves, and do not drink overnight tea, so as not to make the tea fresh, breed germs, and adversely affect the body.
Second, there are clever ways to choose tea, and be wary of "inferior tea"
Drinking tea is beneficial to the body, in addition to containing various nutrients, tea also contains caffeine, which has stimulating, diuretic, cardiotonic, relaxing smooth muscles and helping digestion.
But also be aware that there are good and bad teas, and not all teas are suitable for drinking in the stomach.
Drinking "good tea, healthy tea" can beautify and prolong life, but if you accidentally drink "inferior tea", it will disrupt the normal operation of the body, and at worst it will lead to cancer and irreversible damage to the body.
So, what kind of tea is inferior tea?
The most common "low-quality tea" in life is the "free tea" in various restaurants.
Most of the time people tend to ignore this and often inadvertently drink these most inconspicuous "junk teas", because most of these free teas are not good quality teas.
At this time, some people may ask, the quality of tea will be different, why are these free teas called "garbage tea"?
In fact, the inferior "garbage tea" we call is no longer a problem of its own quality as tea tasters think, but a substandard food safety.
1. Pesticide tea
At present, the biggest problem of inferior tea on the market is that the pesticide residues exceed the standard, and regular drinking is very harmful to our body.
According to an article, an agency has sampled 18 kinds of tea leaves in Beijing, Chengdu and Haikou, and found that almost every tea leaf has more than three pesticides remaining.
The most shocking and worrying thing is that 11 of these tea leaves also use pesticides that are banned by the state from being used on tea.
Tea is a crop, pesticides are certainly inevitable, but pesticides cannot be used casually.
Some pesticides are well dissolved with the passage of time, while powerful pesticides may remain on the tea for several years once they are hit, which is difficult to dissolve.
Drinking this tea for a long time will definitely cause damage to the body.
Not only in the cultivation of tea, many tea processing factories have the problem of aging equipment and unqualified hygiene.
As a result, not only does the tea processing process not reduce agricultural residues, but also breeds other harmful substances.
In mainland China, the three most common harmful microorganisms in tea are: Escherichia coli, Salmonella and aflatoxin.
E. coli can cause vomiting, diarrhea, fever, and in severe cases, it can be life-threatening.
Salmonella can cause acute enteritis, while aflatoxin can be carcinogenic and poisonous.
Therefore, as an ordinary consumer, if you can't determine which free tea can be safely drunk in your stomach, for the sake of health, it is better to be careful and not drink it.
2. Dyeing tea
Not only for the stomach, but also for the liver and kidneys, "inferior tea" may also cause liver and kidney damage, which is what we often call "dyed tea".
Dyed tea, as the name suggests, is tea that has been dyed by secondary processing of tea leaves.
In general, freshly picked tea leaves are naturally more expensive than aged tea because of their higher freshness and quality.
In the tea market, some unscrupulous merchants do not hesitate to resort to fraudulent means in pursuit of profits, and sell old tea leaves through dyeing and selling them as new tea.
Most criminals will use industrial dyes to "refurbish" old tea and sell it to consumers at the price of new tea.
This dyeing method is relatively simple, but the tea leaves are not properly disposed of after leaving the factory, and there is a serious risk of secondary pollution.
Even more frightening, some unscrupulous traders often prefer to use brightly colored industrial dyes, most commonly lead chrome green for green tea and talcum powder for white tea.
However, these substances are highly toxic and can cause serious damage to the liver, kidneys and nervous system, and the impurities in talcum powder also have a certain carcinogenic risk.
Therefore, when purchasing tea, consumers must remain vigilant, not only judge by the appearance and freshness of tea, but also learn to master some identification skills to ensure that the tea purchased is truly safe and healthy.
"Inferior tea" is extremely harmful to the body, so in the choice of tea, we must not be sloppy, and we must have the ability to distinguish good tea from bad tea.
Generally speaking, when buying tea, you should "buy dry but not wet", and good tea often has less water content, and it can be twisted with a light twist.
Good tea leaves smell mellow and uniform in color, and the tea brewed out is clear and bright, while inferior tea often contains impurities at the bottom, and some of them will smell peculiar.
3. Drinking tea correctly is very important
We know that most tea leaves will contain some nutrients and pharmaceutical ingredients to a greater or lesser extent, and drinking tea regularly is also a means to increase nutrition or adjuvant treatment.
But although the tea is good, you can't be greedy, because even if it is good tea, excessive drinking will have some negative effects on the body, especially for some people with special physiques.
I believe that many people who like to drink tea will have such a question, who should not drink more tea?
The answer given by experts to this question is: people with weak gastrointestinal function and poor sleep should not drink more tea.
People with a bad stomach can drink tea, but they can't drink it every day, and they must mainly control the amount of tea they drink.
Usually when we drink tea, we should pay more attention to these points and drink tea correctly.
1. Warm tea should be drunk and drunk
Tea brewed and drunk will be more nutritious and fragrant.
It is generally not recommended to drink overnight herbal tea, because if the time is left for too long, the vitamins will be lost, and the sugar and protein in the tea will also become nutrients for the reproduction of bacteria and molds.
And for middle-aged and elderly people who often suffer from constipation, if the tea is soaked for too long, it will release excess tannins.
Not only may this suppress appetite, but it may also exacerbate the symptoms of constipation.
2. New tea 买来 unnecessary arrival rush
New tea is generally considered superior to aged tea due to its under-oxidized polyphenols, aldehydes, and alcohols, as well as its higher caffeine content.
However, these properties of new tea also mean that it requires a proper aging process to reduce the potential effects on the human body.
Therefore, if you buy new tea, it is recommended to store it for at least half a month.
Let it oxidize naturally, which can effectively reduce irritation, making the taste of tea more mellow and the aroma more pleasant.
3. Store carefully
Tea leaves are highly absorbent and absorb moisture from the air. Tea leaves are also sensitive to light, and when exposed to more sunlight, they will change color and emit peculiar smells.
Therefore, it is best to pack the tea leaves in a clean food bag, then store them in the tea cans, and keep the tea cans in a dry and cool place, or you can also put them in the refrigerator to refrigerate.
4. Drink weak tea and drink less strong tea
Although the taste of strong tea is strong, it is very harmful to the body, which tea lovers should pay more attention to.
Tea itself is not carcinogenic, but long-term drinking of strong tea is an inducing factor for physical diseases, and the rich fluoride in strong tea may bring hidden dangers to kidney health.
In addition, the caffeine and theophylline components contained in strong tea may cause irritation to the mucosal layer of the stomach, and continued consumption may cause stomach discomfort, and in severe cases, it may even induce conditions such as peptic ulcer and heartburn.
The stimulant effects of caffeine should not be overlooked, and frequent consumption of strong tea may lead to an overactive nervous system, which can trigger problems such as insomnia and anxiety.
For specific groups, such as pregnant women, children, the elderly, and patients with heart and gastrointestinal diseases, it is necessary to avoid drinking a large amount of strong tea for a long time, and should carefully choose the type of tea and control the amount of drinking.
5. Drink tea in moderation and at the right time
Although there are many benefits to drinking tea, we should not ignore the harm of craving tea.
Drink tea in moderation, if you drink too much water, the heart and kidneys need to be put under more stress.
In addition, the time to drink tea is also particular, it is more appropriate to drink tea after breakfast or after a nap, but it is also important to note that it is not immediately after a meal.
Before meals and before going to bed, it is not recommended to drink tea, and drinking a large amount of tea before and after meals will also make people excited and insomnia, which is not beneficial to some patients with severe hypertension, coronary heart disease and neurasthenia with frequent angina.
6. Do not take medicine with tea
Scientific studies have shown that tea contains caffeine and tannic acid, and the use of tea to deliver medicine will reduce the efficacy of the medicine, and even have a negative effect.
Therefore, in order to prevent possible health hazards, do not take the medicine with tea as much as possible.
In general, drinking tea does not cause stomach cancer, but it is important to distinguish between "low-quality tea".
Only by "drinking good tea and drinking healthy tea" can we effectively avoid potential health risks and truly play the health preservation role of tea.
At the same time, we must always remember the taboo of drinking tea, develop correct tea drinking habits, and not be greedy for too much.
Through reasonable tea drinking habits, we can maintain the health and balance of the body while enjoying the aroma of tea.