Now tea has become the most popular drink in the world,It is called one of the three health drinks , and there is a saying in China “It is better to go without food for three days than to go without tea for a day”.
Drinking tea seems to have become a pastime for many middle-aged and elderly people nowadays, especially when relatives and friends come , always like to entertain guests with tea.
We have always believed that drinking tea is good for your health, and different teas have different effects. However, there has been controversy about tea on the Internet in recent years There are more and more, Even Peking University has a study showing that drinking more than 4 grams of tea per day will increase the risk of cancer. This study has attracted the attention of netizens. What is the situation? Let’s take a look!
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Peking University research: Drinking more than 4 grams of tea per day, or increase the risk of cancer?
August 2019Professor Li Liming, School of Public Health, Peking University The team conducted a study on the link between tea consumption and cancer risk, published in the European Journal of Epidemiology.
This study used more than 500,000 Chinese people to follow up for 10.1 years, through records Tested the relationship between drinking tea and 6 kinds of cancer (lung cancer, gastric cancer, cancer colorectal cancer, liver cancer, and female breast and cervical cancer).
The analysis found that compared to weekly People who drink tea less than once, drink more than 4 grams of tea per day, the overall cancer risk increases by 26%, the risk of lung cancer increases by 62%, and the risk of gastric cancer increases by 29%.
Follow this This way of saying, is it not possible to continue to drink tea? Even if you want to drink, you must strictly control the amount of tea you drink, isn’t it?
Actually, regarding this study, it is only an observational study, although the sample data is very large, but There are also other factors, such as bad living habits, the way of drinking tea, and the age of the crowd, etc., will become an influencing factor.
To give a very simple example,If you drink tea at the same time If you smoke and drink a lot, the probability of developing cancer will naturally be higher.
However, through this experiment, it can also be found that when excluding a small group of people who do not smoke or drink ,The amount of drinking tea can reach more than 4 grams, compared with people who drink tea less than once a week, the risk of gastric cancer is also increased.
But you don’t have to worry too much about this group of people is not a certain factor, only tea leaves The increase in gastric cancer may also be related to the temperature when drinking tea. There is another factor, the caffeine in tea stimulates the secretion of gastric acid in the stomach.
Comprehensive analysis, I suggest everyone What should you pay attention to when drinking tea? Choose weak tea, because tea contains caffeine, and drinking too strong tea will have adverse effects on the body.
Be careful not to drink hot tea when drinking tea,If the temperature Increases over 65°CTo reduce the risk of esophageal cancer, the temperature should be controlled at around 45°C.
Although drinking tea is good, you should not drink too much tea, especially for people with gastrointestinal discomfort. Strong tea will stimulate the secretion of gastric acid, thereby increasing the burden on the stomach.
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What are the benefits of drinking tea properly?
1. Refreshing
Tea is rich in caffeine,can excite the central nervous system and speed up blood circulation span>, accelerates the metabolism of lactic acid, can help eliminate fatigue, and achieve a refreshing effect.
2. Lose weight and remove fat
Tea is rich in a variety of trace elements, which can promote the production of digestive enzymes and help break down fat The effect of reducing fat, so as to achieve the effect of weight loss and fat loss.
3. Delay aging
Tea leaves are rich in catechins, which are natural antioxidants.can help eliminate Base, can achieve anti-aging effect.
4. Prevention Cardiovascular and cerebrovascular diseases
Tea leaves are rich in tea polyphenols,< strong>It can regulate fat metabolism in the human body and prevent cardiovascular and cerebrovascular diseases.
5. Prevention of dental caries
Tea is a drink with a relatively high fluorine content. Long-term drinking of tea can prevent dental caries.
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Does tea have a shelf life? Can I continue drinking after the expiry date?
In fact, tea also has a shelf life. You can continue to drink if there is no deterioration, and the shelf life of different teas is different. You must drink them strictly according to the shelf life of the tea.
Usually different types of tea and different production processes have different shelf life, Generally, the longer some tea leaves are stored for 1 to 2 years, the taste will be more mellow, and the shelf life is relatively longer, which can be stored for about three years.
Place comparison Long-term tea, if the storage conditions are good, there is no deterioration and you can continue to drink it within the shelf life, but the tea that has been placed for a long time and has expired has actually lost its original nutritional value and may breed bacteria. It is not recommended to continue to drink , if you continue to drink, it may disturb the normal flora in the intestines, causing abdominal pain and diarrhea.