It turned out that Chun Yujun was holding a teacup to brush the webpage, and when he saw the topic # Drinking strong tea for a long time led to severe anemia #, he was still thinking that this was another alarmist headline news. Click in and have a look. The amount of 50g tea ... well, it's too strong.
As one of the three major drinks in the world, drinking tea has many benefits to health, but if it is not done in the right way, health tea may also become harmful.
"Too long to watch" version:
1. Because tea contains polyphenols, alkaloids and other components, drinking tea for a long time has many benefits in antioxidant, dental caries prevention, weight loss and cardiovascular disease prevention.
2. Drinking strong tea for a long time will not only lead to iron deficiency anemia, but also lead to insomnia, stomachache and fluorosis.
3. Adults generally drink 5- 15g tea and 200-800ml tea every day.
4. Different kinds of tea are good for health, and can be selected according to personal needs and tastes.
5. Don't take medicine with tea, because polyphenols, alkaloids and other ingredients in tea soup will react with many drugs, thus affecting the efficacy.
What are the health benefits of drinking tea?
China people have a long history of drinking tea. "Cha Sheng" Lu Yu once wrote in the Book of Tea: "Tea is a drink, which originated from Shennong." Shennong's Classic of Materia Medica also records: "Shennong tasted a hundred herbs and encountered 72 poisons every day, quenching his thirst with tea."
Although these legends and stories have exaggerated elements, modern medicine has proved that drinking tea for a long time does have many benefits in antioxidant, dental caries prevention, weight loss and cardiovascular disease prevention.
1. Anti-oxidation: Tea polyphenols in tea (the general term for polyphenols in tea) have a strong anti-oxidation effect, which can inhibit the formation of free radicals in the human body and directly remove excess free radicals (the explanation of free radicals is complicated, and you can simply understand that it is closely related to human aging and diseases). Studies have shown that the antioxidant capacity of tea polyphenols is 18 times that of vitamin e;
2. Prevention and treatment of radiation damage: Tea polyphenols and their oxidation products also have the ability to absorb radioactive substances. Clinical research shows that the effective rate of tea extract for mild radiation sickness caused by radiotherapy in tumor patients is over 90%, and the effective rate for cytopenia is 865438 0.7%.
3. Refreshing the brain: Caffeine in tea has physiological functions such as strengthening the heart, diuresis and exciting the central nervous system, which can make people feel refreshed and enhance their thinking and memory ability (stepping on betel nut again, this is a good thing to refresh their minds! );
4. Reduce fat and lose weight: polyphenols, saponins (dài), alkaloids and other substances in tea can significantly affect human lipid metabolism, and catechins can also reduce the absorption of fat in the small intestine. Of course, if you are high in oil and fat all day and don't exercise, you may only lose weight by drinking tea.
5. Prevention of dental caries: Tea tree is a plant rich in fluorine. The fluorine content in drinking water in most areas and cities in China is less than 0.5 μ g/g, while the fluorine content in tea soup can reach 5 μ g/g, so drinking tea often can make up for the shortage of fluorine in drinking water, thus playing a role in preventing dental caries;
6. Prevention of cardiovascular disease: A large number of cohort studies show that drinking tea at least three times a week can significantly reduce the risk of cardiovascular disease, death and death from various causes, because polyphenols in tea can reduce oxidative stress and inflammatory reaction, and improve the functions of vascular endothelium and myocardial cells.
Why not drink strong tea?
Although there are a lot of health benefits of drinking tea, "tea soup is good, you should not be greedy." If you drink too much tea, it will do harm to your health.
In fact, there is no uniform definition of strong tea. According to the suggestion of China Institute of Food Science and Technology, adults usually drink 5- 15g tea and 200-800ml tea every day.
Long-term high-intensity outdoor workers, people with high energy consumption or greasy diet can appropriately increase the amount of tea drinking; Pregnant women, children, neurasthenia, iron deficiency anemia, tachycardia, etc. , should be appropriate to reduce the amount of tea.
So at the beginning of the article, Uncle Wang in the news, the amount of tea about 50g a day is really too much! Coupled with a light diet, if you don't often eat foods with high iron content such as animal liver, it is really easy to be anemic!
Because tea contains more caffeine, and caffeine has a refreshing effect, drinking tea before going to bed, or drinking a lot of strong tea, can easily affect sleep (but some people have a good tolerance for caffeine, and they can sleep well even after drinking tea).
Similarly, caffeine's nerve-stimulating effect will also act on the stomach, thus promoting gastric juice secretion and gastrointestinal peristalsis. If the stomach is empty, hyperacidity will stimulate the gastric mucosa, causing burning or stinging discomfort, so don't drink strong tea on an empty stomach.
As we said before, tea contains a lot of fluorine, which can prevent dental caries if eaten properly. However, fluorine and its compounds are also toxic. Excessive intake (fluoride in the body exceeds 1.5mg-4.0mg per day) may lead to fluorosis, dental fluorosis (brown spots and plaques on the surface of teeth), fluorosis (severe deformation of bones and joints, even paralysis), etc., and may also make kidneys.
If you drink strong tea as water every day, it will obviously increase the risk of fluorosis.
In addition, under certain conditions, polyphenols and alkaloids in tea will interact or react with other nutrients ingested in the body at the same time, thus affecting their activity or absorption. For example, tea polyphenols can react with trivalent iron ions to form insoluble precipitates, which reduces the absorption and utilization of iron by human body. Drinking strong tea for a long time can lead to iron deficiency anemia.
How to choose tea?
At present, there are six categories of green tea, white tea, yellow tea, oolong tea (green tea), black tea and black tea in China's market. Among them, green tea belongs to non-fermented tea, white tea and yellow tea belong to micro-fermented tea, oolong tea belongs to semi-fermented tea, black tea belongs to post-fermented tea, and black tea belongs to fully fermented tea.
These teas have slightly different effects. For example, green tea is not fermented, but tea polyphenols, caffeine and other substances remain more. After black tea is fully fermented, there are relatively few components such as tea polyphenols and caffeine.
Therefore, to lose weight and refresh yourself, you can choose green tea; If you are intolerant of caffeine, you will be flustered, insomnia and stomachache after drinking it. You can choose black tea. If you don't feel anything, choose your favorite taste.
When purchasing tea, we can judge the quality from four aspects: color, fragrance, taste and shape. Good tea is pure and shiny in appearance, bright and clear in soup color, pure in aroma and refreshing. For example, the bottom bud leaves of super Longjing tea are bright green, flat and tender. Good quality green tea tastes fresh and sweet after drinking, and good quality black tea tastes sweet and mellow.
Although the health-preserving veteran cadres in film and television dramas often use thermos cups to make tea, in fact, high temperature and long-term thermal environment will destroy many vitamins and aroma components in tea and affect the flavor and health care efficacy of tea, so it is enough to make tea with utensils made of ceramics, glass, metal and other materials.
Finally, I need to remind you not to drink tea and take medicine. Because polyphenols, alkaloids and other components in tea soup will react with many drugs, thus affecting the efficacy. Drugs such as blood-enriching syrup, protease and multi-enzyme tablets should not be taken with tea, nor should sedative and hypnotic drugs be taken with tea.
References:
[1] Wang. A prospective cohort study on the relationship between drinking tea and milk intake and cardiovascular diseases in China residents [D]. Peking Union Medical College, 2020.
[2] Qiao Peng. On the regulating effect of tea polyphenols on athletes' physical function [J]. Fujian Tea, 202 1, 43 (3): 93-94. DOI: 10.3969/j . ISSN . 1005-22965438。
[3] Zhu Yongxing, HERV? Huang, Yang Changyun. Harm of improper tea drinking to health: phenomenon, mechanism and countermeasures [J]. bulletin of science and technology, 2005,21(5): 571-576. DOI: 10.3969/j . ISSN . 65438+。
[4] State Administration of Market Supervision, Tea Consumption Tips, 202 1-05-24,/spcjs/yjjl/spyj/202105/t20210524 _ 329795.html.