In China, the famous green teas are Longjing, scented tea and Biluochun. They can not only be directly processed and drunk, but also be made into tea cakes or stir-fried dishes, all of which are very delicious foods. So do you know the efficacy, functions and taboos of green tea? Let's have a look.

Functions and taboos of green tea 1 functions and functions of green tea;

1, which is helpful to delay aging, has strong antioxidant and physiological activity, and is a scavenger of human free radicals. According to the research of relevant departments, the effect of 1 mg tea polyphenols on eliminating excessive free radicals harmful to human body is equivalent to 9 micrograms of superoxide dismutase (SOD), which is much higher than other similar substances. Tea polyphenols can block lipid peroxidation and remove active enzymes. According to the test results of Tomoyo in Ota, Japan, it is confirmed that the anti-aging effect of tea polyphenols is 18 times stronger than that of vitamin E.

2. It helps to inhibit cardiovascular diseases, and tea polyphenols play an important role in human fat metabolism. The human body has cardiovascular diseases such as high cholesterol and triglycerides, such as fat deposition on the inner wall of blood vessels and atherosclerotic plaques formed after vascular smooth muscle cells proliferate. Tea polyphenols, especially catechins ECG and EGC in tea polyphenols and its oxidation products theaflavins, are helpful to inhibit this mottled proliferation, reduce the formation of fibrinogen that enhances coagulation viscosity, make coagulation clear, and thus inhibit atherosclerosis.

3. Tea polyphenols that help to prevent cancer can block the synthesis of various carcinogens such as ammonium nitrite in the body, and have the function of directly killing cancer cells and improving the immunity of the body. According to relevant data, tea polyphenols (mainly catechins) in tea are beneficial to the prevention and adjuvant treatment of cancers such as gastric cancer and intestinal cancer.

4. It is helpful to prevent and treat radiation injury. Tea polyphenols and their oxidation products have the ability to absorb the toxicity of radioactive substances strontium 90 and cobalt 60. According to the clinical trials of relevant medical departments, the treatment of mild radiation sickness caused by radiotherapy with tea extract can reach more than 90%. For cytopenia, the effective rate of tea extract is 865438 0.7%; It has a good therapeutic effect on leukopenia caused by radiation.

5. It is helpful to inhibit and resist viruses. Tea polyphenols have a strong astringent effect, have obvious inhibitory and killing effects on pathogenic bacteria and viruses, and have obvious anti-inflammatory and antidiarrheal effects. Many medical units in China use tea preparation to treat acute and chronic dysentery, amebic dysentery and influenza, and the cure rate is about 90%.

6, contribute to beauty and skin care tea polyphenols are water-soluble substances. Washing your face with it can clear the greasy face, astringe pores, disinfect, sterilize, delay skin aging, and reduce the damage of ultraviolet rays in the sun to the skin.

7. Caffeine in tea can stimulate the central nervous system of human body, enhance the excitement process of cerebral cortex, and play a refreshing role.

8. Caffeine in tea can stimulate the kidney, promote the rapid excretion of urine, improve the filtration rate of the kidney and reduce the retention time of harmful substances in the kidney. Caffeine can also eliminate excessive lactic acid in urine, which helps to eliminate fatigue as soon as possible.

9. Helps to lower blood fat and help digestion. It was recorded in Materia Medica of the Tang Dynasty that the effect of tea was "to lose weight for a long time". There is a saying among the ethnic minorities in China's border areas that "tea is indispensable for a day". Because tea helps digestion and reduce fat, in today's fashionable language, it is helpful to "lose weight". This is because caffeine in tea can increase the secretion of gastric juice, help digestion and enhance the ability to decompose fat. The so-called "long-term eating makes people thin" is here.

Taboo of green tea

Although it is good for pregnant women to drink green tea, everyone should also pay attention to drinking it in moderation. If pregnant women drink too much tea, it will do harm to the fetus.

Tea contains a small amount of caffeine, which has an exciting effect. Drinking too much tea will stimulate the fetus to increase fetal movement and even endanger the growth and development of the fetus. In addition, tea contains tannic acid, which can combine with iron in pregnant women's food to form compounds that cannot be absorbed by the human body. If pregnant women drink too much strong tea, it may cause anemia during pregnancy, and the fetus may also suffer from congenital iron deficiency anemia.

Through the above introduction, we find that it is not recommended for pregnant women to drink tea during pregnancy, because the caffeine contained in tea will actually have adverse effects on the fetus, so we hope that pregnant women can abide by these dietary principles, so as to better provide a good growth environment for the fetus.

Further reading: What is green tea?

Green tea refers to the finished product made of new tea leaves without fermentation, through typical processes such as enzyme fixation, rolling and drying. The color of the finished product and the brewed tea soup retain the green theme of new tea.

As the main tea in China, green tea has an annual output of 654.38+10,000 tons, ranking first among the six primary teas. China produces all kinds of green tea. Zhejiang, Henan, Anhui, Jiangxi, Jiangsu, Sichuan, Hunan, Hubei, Guangxi, Fujian and Guizhou are the main green tea producing provinces in China.

Green tea is not fermented, and it is the most abundant and widely consumed tea in China. It is characterized by clear soup and green leaves.

Hangzhou Longjing, Huangshan Mao Feng, Dongting Biluochun, Lushan Wu Yun, Liuhan Tea, Xinyang Maojian Tea, Emei Zhuyeqing, Lu 'an Guapian, Ancient Bamboo Purple Shoots, Jiangshan Green Peony, Taiping Monkey Kui, Golden Huiming, Laozhu Dafang, Enshi Yulu, Mengding Gan Lu, Jianchun Tea and Xiuning Songmeng all belong to the category of green tea.

Green tea is made by picking fresh leaves, killing various oxidases at high temperature to keep the tea green, and then rolling and drying. Clear soup and green leaves are the same characteristics of green tea quality.

Functions and taboos of green tea II. What is green tea?

Green tea is one of the main tea leaves in China, which refers to a beverage made from the new leaves or buds of tea trees without fermentation, and through the processes of enzyme fixation, shaping and drying. The color of the finished product and the brewed tea soup retain the green style of new tea. Drinking green tea regularly can prevent cancer, reduce fat and lose weight, and also reduce the harm of nicotine to smokers.

Without fermentation, green tea retains the natural substances of fresh leaves, and contains many nutrients such as tea polyphenols, catechins, chlorophyll, caffeine, amino acids and vitamins. These natural nutrients in green tea have special effects of anti-aging, anti-cancer, sterilization and anti-inflammation, which are beyond the reach of other teas. Green tea is a kind of tea made from suitable new shoots of tea trees through typical technological processes such as enzyme fixation, rolling and drying. Its dry tea color and brewed tea soup and tea leaves are mainly green, hence the name green tea. Green tea is made from fresh leaves that have been picked, killed by various oxidases at high temperature, kept green, and then kneaded and dried. Clear soup and green leaves are the same characteristics of green tea quality. China produces all kinds of green tea. Henan, Guizhou, Jiangxi, Anhui, Zhejiang, Jiangsu, Sichuan, Shaanxi (southern Shaanxi), Hunan, Hubei, Guangxi and Fujian are the main green tea producing provinces in China.

Second, the effect of drinking green tea

1. Excitement: Caffeine in tea can excite the central nervous system, help people cheer up, improve thinking, eliminate fatigue and improve work efficiency.

2. Diuretic effect: Caffeine and theophylline in tea have diuretic effect and are used to treat edema and stagnant tumors. Acute icteric hepatitis can be treated by detoxification and diuresis with black tea syrup.

3. Cardiotonic and antispasmodic effects: Caffeine has the effects of cardiotonic, antispasmodic and relaxing smooth muscle, can relieve bronchospasm and promote blood circulation, and is a good auxiliary drug for treating bronchial asthma, relieving cough and resolving phlegm and myocardial infarction.

4. Inhibition of arteriosclerosis: Both tea polyphenols and vitamin C in tea have the effects of promoting blood circulation and removing blood stasis, preventing arteriosclerosis. Therefore, among people who often drink tea, the incidence of hypertension and coronary heart disease is low.

5. Antibacterial and bacteriostatic effects: Tea polyphenols and tannic acid in tea act on bacteria, which can solidify the protein of bacteria and kill them. Can be used for treating intestinal diseases such as cholera, typhoid fever, dysentery and enteritis. The skin is swollen and painful, festering and purulent, and the skin is broken by trauma. Washing the affected area with strong tea has anti-inflammatory and bactericidal effects. Oral inflammation, ulceration, sore throat, treated with tea, also has a certain effect.

6. Lose weight: Caffeine, inositol, folic acid, pantothenic acid and aromatic substances in tea can regulate fat metabolism, especially oolong tea has a good decomposition effect on protein and fat. Tea polyphenols and vitamin C can lower cholesterol and blood lipids, so drinking tea can reduce weight.

7. Anti-caries effect: Tea contains fluorine, and fluoride ions have great affinity with calcium in teeth, which can become a kind of "fluorapatite" that is difficult to dissolve in acid, just like adding a protective layer to teeth, which improves the ability of teeth to resist acid and prevent caries.

8. Inhibitory effect on cancer cells: It is reported that flavonoids in tea have different anti-cancer effects in vitro, among which vitexin, morin and catechin have stronger effects.

Third, the preservation method of green tea

1. Lime block preservation method

The quicklime blocks are packed in bags made of fine white cloth. Put the green tea in a white cotton paper bag, wrap it in a kraft paper bag, then wash and dry the small pottery jar, and put white paper under it. Green tea bags are put in small-mouthed pottery pots with one or two lime bags embedded in the middle. Seal the altar with several layers of grass, and finally compact it with bricks or planks to reduce air exchange. After that, the preservation should be checked frequently, and the lime should be replaced in time after deliquescence.

2. Carbon storage methods

The operation method is basically the same as the lime block preservation method. The materials used are only burnt charcoal, and the tea set can be replaced by a crock or a small iron drum. The capacity of charcoal bag and green tea bag can be increased or decreased according to the size of the container.

3. Cold storage method of green tea

Drying tea leaves with steam, the water content is between 3% and 5%, not exceeding 6%. Green tea and tea leaves are put into aluminized composite bags, heat sealed, air in the bags is pumped out by a breathing air pump, nitrogen is injected at the same time, sealed with a sealing paste, placed in a tea box, and then stored in a low-temperature refrigerator. This method is the best fresh-keeping method of tea under the current scientific and technological level. Large storage capacity and long time.

Fourth, avoid people who drink green tea.

1. Pregnant women should avoid drinking tea, especially strong tea. Green tea contains a lot of tea polyphenols and caffeine, which has many unfavorable factors for the growth of the fetus in the mother's womb. In order to make the fetal intelligence develop normally and avoid excessive stimulation of caffeine to the fetus, pregnant women should drink less or not.

2. Women should not drink strong tea during lactation. Drinking strong tea during lactation, too much caffeine will enter the milk, and children will be indirectly excited after breastfeeding, which will easily lead to less sleep and more crying.

Avoid drinking tea if you have a fever. Caffeine in green tea can not only raise the body temperature, but also reduce the efficacy.

Patients with liver disease should avoid drinking tea. Most substances such as caffeine in green tea are metabolized by the liver. If the liver is ill, drinking too much tea will damage the liver tissue.

5. Patients with urinary calculi should avoid drinking tea. Urinary calculi are usually calcium oxalate stones. Because tea contains oxalic acid, it will form stones with calcium excreted in urine. Patients with urinary calculi will get worse if they drink a lot of tea.

6. Old people should not drink raw tea. The so-called green tea refers to the green roasted green tea that is directly dried without twisting after being immobilized. This kind of tea has a natural green appearance, and its components are basically the same as those contained in fresh leaves. Aldehydes and alcohols with low boiling point do not transform and volatilize much, and the aroma is seriously green. Drinking this kind of green tea for the elderly is very irritating to the gastric mucosa, and it is easy to have a stomachache after drinking; Young people will also have a feeling of stomach discomfort after drinking, which is also commonly known as "scraping the stomach." If you buy this kind of raw tea by mistake, you'd better not make it directly. You can put it in a non-greasy iron pan, fry it slowly with slow fire, roast it to get rid of the green gas, and drink it after it produces a slight chestnut fragrance.

7. Green tea should not be drunk at the same time as medlar, and patients should not drink tea during taking medicine!

Functions and Taboos of Green Tea 3 Green tea is called "national drink" in China. Tea contains many biochemical components closely related to human health. Tea has the pharmacological effects of refreshing brain, clearing away heat and relieving summer-heat, promoting digestion and resolving phlegm, relieving fatigue and losing weight, clearing away heart fire, relieving hangover, quenching thirst, reducing fire, improving eyesight, stopping dysentery and removing dampness, and prolonging life. Tea contains polyphenols, which has strong antioxidant and physiological activity, and is a cleaner of human free radicals.

Efficacy and function of green tea

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 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.

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 cancer prevention

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.

Efficacy, function and taboo of green tea 4 1. Green tea reduces fat and loses weight.

Modern medical research shows that green tea contains amino acids, phenolic derivatives, aromatic substances, vitamins and so on. The comprehensive effects of these substances, especially tea polyphenols, catechins and vitamin C, can promote fat burning and reduce blood lipids and cholesterol. Therefore. For female friends, drinking green tea often can help digestion and reduce fat and weight.

2. Green tea prevents cardiovascular and cerebrovascular diseases.

Tea polyphenols in green tea can dissolve fat, while vitamin C can promote cholesterol excretion. Green tea also contains tea gan ning, which can enhance the toughness of blood vessels. If you drink it regularly, blood vessels are not easy to rupture. Therefore, drinking green tea regularly can reduce the risk of dying of heart disease.

3. Green tea delays aging

In the process of human metabolism, large star free radicals will be produced, and cells in the body will also be damaged. Superoxide dismutase (SOD) 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 the activity of superoxide dismutase and scavenge free radicals. Therefore, drinking green tea regularly can play a role in delaying aging.

4. Green tea prevents bad breath

Catechins contained in green tea can effectively inhibit cariogenic bacteria and reduce the occurrence of dental plaque and periodontitis. In addition, tannic acid in green tea has bactericidal effect, which can prevent food residues from breeding bacteria. So drinking green tea often can effectively prevent bad breath.

5. Green tea can improve indigestion.

If acute diarrhea is caused by bacteria, you can drink green tea to relieve indigestion symptoms.

6. Green tea can prevent cancer

Studies have shown that the organic anticancer substances in green tea are mainly theophylline, tea polyphenols, vitamin C and vitamin E; The inorganic anticancer elements in tea are mainly selenium, molybdenum, manganese and germanium. Especially caffeine and tea polyphenols, their combined action not only has the effect of refreshing the brain, but also has the effect of improving human immunity and preventing cancer.

7. Green tea sun protection

Catechins in green tea have strong antioxidant function. Ultraviolet rays can produce a lot of peroxides on the skin, making the skin rough and inelastic. If tea containing catechins is applied in advance, the content of peroxide (free radicals) in the skin will be reduced by more than 25%, so drinking green tea also has a sunscreen effect.

8. Green tea protects nerve cells

Polyphenols in green tea can protect nerve cells. Polyphenols can activate the factors supporting cell survival and inhibit the factors leading to cell death and neurodegenerative diseases, thus improving the survival rate of nerve cells and reducing the damage of acidic substances to nerve cells.

9. Green tea lowers cholesterol

As mentioned above, green tea can prevent and treat cardiovascular diseases, and vitamin C in tea can reduce the deposition of cholesterol on the blood vessel wall and expel cholesterol.

10. Green tea can prevent influenza.

Tea acid contained in green tea can combine with influenza virus to reduce the infection of virus to healthy cells.

Family storage method of green tea

There are generally five ways to preserve green tea at home:

Pot tea storage method. This method existed in ancient times. As the saying goes in Meng Zhen, Feng Ming, "If you put tea in a big urn with a grate at the bottom and turn it upside down, it won't turn yellow in summer, so its air won't leak out." The water content of tea should not exceed 6%. Lime can be used to remove moisture. The specific operation method is the same as that of lime block preservation.

Canning method. Containers are made of metal cans, boxes, cans, boxes, iron or aluminum, paper or paper products, and are square, round, flat or irregular. It is important that the tea leaves are dry and the bag mouth is sealed. This method is simple and convenient.

Plastic bags store tea. Choose high-density, high-pressure, thick, strong and tasteless food packaging bags. Tea leaves can be wrapped in soft and clean paper in advance and then sealed in food bags.

Hot water bottles store tea. You can use a waste thermos bottle with poor thermal insulation, fill it with dry green tea, cover the bottle stopper and seal it with wax.

Refrigerator preservation method. Green tea is packed in high-density, high-pressure, thick, strong and tasteless food packaging bags, and then put into the freezer or freezer of the refrigerator. This method has long storage time and good effect, but the bag mouth must be sealed tightly, otherwise it will regain moisture or smell, which will damage the quality of green tea.

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