There are different opinions about the various beneficial effects of green tea on people's body and mind, ancient and modern, at home and abroad, and Liu's Ten Virtues in Tang Dynasty is more comprehensive. He classified the benefits of drinking tea as follows: drinking tea for health, removing fishy smell, preventing diseases and nourishing qi, dispersing sulks, benefiting people, respecting people, nourishing the heart and using tea is feasible.
1. Green tea anti-aging
Antioxidants contained in green tea help to fight aging. Because in the process of human metabolism, if it is over-oxidized, it will produce a lot of free radicals, which are easy to age and cause cell damage. SOD (Superoxide Dismutase) is a kind of free radical scavenger, which can effectively remove excess free radicals and prevent the harm of free radicals to human body. Catechins in green tea can significantly improve SOD activity and scavenge free radicals.
2. Green tea is antibacterial
Studies have shown that catechins in green tea can inhibit some bacteria that cause human diseases without harming the proliferation of beneficial bacteria in the intestine, so green tea has the function of whole intestine. Studies have shown that tea polyphenols can eliminate excessive harmful free radicals in the body, regenerate efficient antioxidant substances such as α-VE, VC, GSH and SOD in the human body, thus protecting and repairing the antioxidant system, which has a significant effect on enhancing immunity, preventing cancer and preventing aging. Drinking green tea for a long time can reduce blood sugar, blood lipid and blood pressure, thus preventing cardiovascular and cerebrovascular diseases. The medical research team of Showa University in Japan diluted 1 ml tea polyphenols solution to 1 of the concentration of ordinary tea, and put it into 10000 highly toxic Escherichia coli 0- 157. Five hours later, all the bacteria died, leaving none.
3. Green tea lowers blood fat
Animal experiments made by scientists show that catechins in tea can reduce total cholesterol, free cholesterol, low-density lipoprotein cholesterol and triglycerides in plasma, and at the same time increase high-density lipoprotein cholesterol. Human experiments show that it can inhibit platelet aggregation and reduce the incidence of arteriosclerosis. Green tea contains flavonol, which has antioxidant effect, prevents thrombosis and platelet aggregation, and reduces cardiovascular diseases.
4. Green tea slimming and fat reduction
Green tea contains theophylline and caffeine, which can activate protein kinase and triglyceride lipolytic enzyme through multiple functions, reduce the accumulation of fat cells, and thus achieve the effect of losing weight.
5. Green tea can prevent dental caries and remove bad breath.
Green tea contains fluorine, in which catechins can inhibit the action of cariogenic bacteria and reduce the occurrence of dental plaque and periodontitis. Tannic acid contained in tea has bactericidal effect, which can prevent food residues from breeding bacteria, so it can effectively prevent bad breath.
6. Green tea can prevent cancer
Green tea can inhibit some cancers, but its principle is limited to the inference stage. Drinking more tea is bound to have a positive encouraging effect on preventing cancer.
7. Whitening and UV protection of green tea
Experts found in animal experiments that catechins in green tea can resist skin cancer caused by UV-B.
8. Green tea can improve indigestion.
Recent research reports show that green tea can help improve indigestion, such as acute diarrhea caused by bacteria, and drinking a little green tea can alleviate the condition.
5, green tea health care precautions
At present, green tea has become the most popular health care product. In particular, the overwhelming rendering effect of some advertisements and the endless stream of related beauty and health products with green tea as the main component make some people regard green tea as the best choice for skin care and fitness. In this regard, relevant experts remind the majority of female consumers not to blindly follow the trend. As a health care product, green tea is not harmful to health, but if it is made into products by various businesses together with other raw materials, we should pay attention to some details.
Green tea skin care products have good efficacy and limited validity.
Although the effect of green tea skin care products is good, there are still some considerations in choosing such products. In green tea, tea polyphenols are one of the main substances that play a role in skin care and beauty. This substance has antioxidant effect, and it can replenish water and tighten skin when used in combination with vitamins B and E. However, it should be noted that tea polyphenols, as the general name of phenolic substances or their derivatives, are easy to volatilize in the air and lose their antioxidant effect. Therefore, this kind of skin care products, especially facial masks, had better be the new tea products of that year.
Drink green tea to lose weight and prevent diseases, but drink it carefully during menstruation.
Green tea contains a certain amount of caffeine. When it coexists with tea polyphenols, it can prevent the function of caffeine in the stomach, avoid stimulating the secretion of gastric acid, and make the disadvantages of caffeine not play in the body, but promote the functions of the central nervous system, heart and liver. Moreover, the aromatic compounds in green tea can also dissolve fat and prevent fat from accumulating in the body. Caffeine can also promote the secretion of gastric juice, help digestion and fat elimination. However, it is best for women not to drink more alcohol during menstruation. Studies have shown that in addition to the normal iron loss of human body, women will also lose 18 ~ 2 1 mg of iron during each menstrual period. Drink more green tea during menstruation, and more tannic acid in green tea will combine with iron molecules in food, forming a large number of sediments, which will hinder the absorption of iron molecules by intestinal mucosa. Moreover, the stronger the green tea is, the greater the obstacle to iron absorption.
Green tea drinking and green tea set 1: porcelain cup green tea
Porcelain cup green tea is suitable for soaking high-grade green tea, such as first-and second-grade fried green tea, pearl green tea, baked green tea, sun-dried green tea, etc., and the emphasis is on palatability, taste or thirst quenching. Generally, after observing the color, fragrance and shape of tea leaves, brew them in cups. You can use the "throwing method" or "throwing method" to brew with boiling water at 95- 100℃, and cover the cup to prevent the fragrance from escaping, keep the water temperature to facilitate the development of the tea body and accelerate the sinking under the cup. After 3-5 minutes, open the lid, smell the tea and taste it. According to the degree of tea soup, drink until three times. This method of making tea is more convenient for guests to worship tea and drink tea during office hours.
Cup soaking method, the proportion of tea depends on people's taste, and it is generally appropriate to soak 3 grams of tea in 200cc. Those who like strong drinks can add more tea, and those who like weak drinks can add less tea.
Green tea drinking and green tea set 2: green tea in glass
Soaking green tea in a glass is suitable for drinking delicate and precious green tea, which is convenient for fully appreciating the appearance and quality of famous tea.
Appreciate the color, fragrance and shape of dry green tea before soaking. Take a cup of tea, put it on a white paper without peculiar smell, and observe the shape of the tea. The shape of famous tea depends on different varieties, such as strip, flat, spiral or needle ... Appreciate the making process of green tea, check the color of green tea, whether it is green, dark green, yellowish green, or how much ... Then dry smell the aroma of green tea, or cream, or chestnuts, or pot-fried, or indescribable fresh tea fragrance ... and then enter the brewing.
Soaking delicate and famous green tea in a transparent glass is convenient for observing the process of tea slowly stretching, swimming and changing in water, which is called "green tea dance". The specific operation of making green tea depends on the tightness of green tea strips, and two brewing methods are adopted respectively. One is to brew famous teas with firm and solid appearance, such as Longbin Green Tea, Biluochun Green Tea, Duyun Maojian Green Tea, Mengding Gan Lu Green Tea, Lushan Wu Yun Green Tea, Fujian Lian Xin Green Tea, Lingyun Bai Hao Green Tea, Yongxihuoqing Green Tea, Gao Qiao Yinfeng Green Tea and Cangshan Qing Xue Green Tea. , and "green tea pouring method" can be used. That is, after washing the teacup, first pour boiling water at 85-90℃ into the cup, and then put the green tea into it. Generally, without a cover, green tea leaves will automatically sink slowly, but first some will sink straight, some will swim slowly, and some will rise and fall and then fall to the bottom of the cup. Dry green tea absorbs water, and the leaves gradually spread out, showing a bud, a leaf and two pieces, a single bud and a single leaf, with buds like spears and swords and leaves like flags; The water vapor in noodle soup keeps rising with the aroma of tea, such as steaming clouds, smelling the aroma of tea soup while it is hot, which is refreshing; Observe the color of tea soup, either yellow and green, or milky white with green, or light green with yellow ... Looking at the sun through the cup, you can also see fine hairs swimming, shining and dotted in the soup. Green tea leaves are delicate and delicate, and there are many loose hairs in the soup, which is the characteristic of green tea. This process is called wet appreciation.
When the tea soup of green tea is cool to taste, you should sip it in a small mouth and swallow it slowly, so that the tea soup can fully contact with the taste buds of the tongue and experience the charm of famous green tea. At this time, the tongue and nose can be used together, and the aroma of green tea can be tasted from the tea soup, which is refreshing. This means that once the tea leaves are opened, the fresh taste of tea and the fragrance of green tea are emphasized. When the green tea soup in the cup is still one-third of the water (it is not suitable to drink it all at once), adding boiling water means that the second green tea is opened. If you soak in the famous green tea with rich tea leaves, the second green tea soup will be very strong, the tongue will be very sweet after drinking, and the aftertaste will be endless, leaving fragrance on your teeth and cheeks and making you feel comfortable. Drink it three times, the taste of tea is generally weak, and it will be tasteless after drinking water.
Second, the famous green tea is mainly scattered tea, such as Lu 'an Guapian green tea, Huangshan Mao Feng green tea, Taiping Monkey Kui green tea, Shucheng Orchid green tea and so on. If the "throwing method" is used, the green tea leaves will not sink easily when floating on the noodle soup. You can use the "throwing method", that is, after enjoying the dry green tea, put the green tea into the cup, stop for two minutes when the cup is filled with 90℃ boiling water, and then flush it until it is full. At this time, the leaves of green tea are either hovering and sinking, or hovering between ups and downs, observing the dynamic form of tea, which is unique to tea. Enjoy and drink as before.
It is possible to soak delicate and famous green tea in opaque white porcelain cups, but it is a disadvantage that you can't see the overall change of green tea in the cups and you can't fully appreciate the tea taste in the green tea soup.
Green tea drinking and green tea set 3: making green tea in a teapot
Generally speaking, it is not appropriate to soak and drink exquisite and famous green tea. Because there is a lot of water, it is not easy to cool down, which will suffocate the green tea and make the green tea lose its fresh fragrance. Pot bubble method is suitable for brewing middle and low grade green tea, which is rich in cellulose, resistant to brewing and rich in tea fragrance. When making tea, first clean the pot, put the green tea into the pot, brew it with boiling water at 100℃ until it is full, and put it into a cup for drinking after 3-5 minutes. People who drink tea for a long time, it is better to soak the pot, because they are not enjoying the taste of tea, but quenching their thirst, or chatting over tea, or eating snacks to chat with tea friends.
Offering tea to guests is a common courtesy of people of all ethnic groups in China. Generally, the method of soaking cups is more grand. The method of making green tea in pot is rather vulgar. In some areas, in order to show respect for guests, sugar is added to green tea to show sweetness.
9, suitable for the crowd
Ordinary people can drink it.
1. Suitable for hypertension, hyperlipidemia, coronary heart disease, arteriosclerosis, diabetes, people who eat too much greasy food and drunk people.
2. Not suitable for fever, renal insufficiency, cardiovascular diseases, habitual constipation, digestive tract ulcer, neurasthenia, insomnia, pregnant women, lactating women and children.