1, which can lower blood pressure. There is theanine in black tea, which can activate dopaminergic neurons and control the increase of blood pressure. Catechins and caffeine contained in tea can relax blood vessels and lower blood pressure.
2, it can be sterilized. The colors of black tea soup include theaflavins and thearubigins. Theaflavins are free radicals and antioxidants, which can resist Staphylococcus aureus, Enterobacteriaceae and so on.
3, can detoxify and diuretic. Caffeine in black tea has diuretic effect and can also help detoxify alcohol. Tea polyphenols can alleviate the toxic effects of heavy metals.
Disadvantages:
1, black tea contains caffeine and tea polyphenols, which is not conducive to the growth of the fetus in pregnant women. Caffeine will affect the neural development of the fetus, and anemia and lactating women are not suitable for drinking black tea, which will be harmful to the body.
2, black tea contains more tea pigments, and drinking too much will leave tea stains on your teeth.
3, black tea can quickly neutralize blood sugar, if people with hypoglycemia or hypotension drink it, they will easily feel sick and dizzy.
If people with insomnia are not suitable for drinking black tea, the caffeine and aromatic substances contained in tea will make people excited and difficult to sleep.
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Drinking water also contains a lot of tannic acid, which can be combined with protein, vitamins and trace elements in food and other substances needed by the human body, resulting in these nutrients not being normally absorbed by the human body. Over time, it is easy to cause malnutrition in the body, such as constipation and anemia, which is very harmful to health.
Although black tea has a certain health care effect on the body and has a good therapeutic effect on cancer, aging, hypertension and hyperlipidemia, it is not suitable for everyone. Experts suggest that it is best for women not to drink black tea during lactation. This is because excessive drinking of black tea will affect the mother's milk secretion, and the caffeine contained in tea will also be transmitted to the child through the milk, thus indirectly affecting the child's physical development.
Tea polyphenols and their oxidation products in black tea can dissolve fat and promote the discharge of lipid substances, thus reducing the contents of total cholesterol, free cholesterol, low-density lipoprotein cholesterol and triglyceride in blood, thus reducing cholesterol deposition on arterial wall and reducing the incidence of arterialization. Moreover, dark tea is rich in vitamin B 1, which plays an important role in the exothermic process of fat oxidative decomposition and can promote fat burning.
References:
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