Green tea is made without fermentation, so it retains more natural substances of fresh leaves and contains more nutrients such as tea polyphenols, catechins, chlorophyll, caffeine, amino acids and vitamins.
The natural nutrients contained in green tea can prevent aging, resist cancer, sterilize and have anti-inflammatory effects.
Green tea is called "national drink" in China. A large number of studies in modern science have confirmed that tea does contain biochemical components closely related to human health. Tea not only 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 and vexation, detoxifying and sobering up, promoting fluid production to quench thirst, reducing fire and improving eyesight, stopping dysentery and removing dampness.
Green tea also has certain pharmacological effects on modern diseases, such as radiation diseases, cardiovascular and cerebrovascular diseases, cancer and other diseases. The main components with pharmacological effects in tea are tea polyphenols, caffeine, lipopolysaccharide, theanine and so on.
What are the benefits of drinking green tea?
Can delay aging
Green tea contains a kind of tea polyphenols, which has strong physiological activity and antioxidant capacity, can help the human body to resist aging, and is a free radical scavenger for the human body, which is very effective.
Green tea can inhibit the occurrence of cardiovascular and cerebrovascular diseases. This is because tea polyphenols can promote fat metabolism in the body. However, fat is the main cause of "three highs" in human body, and "three highs" can easily lead to cardiovascular and cerebrovascular diseases. Therefore, drinking green tea regularly is very helpful to prevent cardiovascular and cerebrovascular diseases.
Can prevent the occurrence of cancer
Tea polyphenols contained in tea can prevent a variety of songs that may cause cancer in the body, and have certain lethality to a variety of cancer cells.
Can diminish inflammation and stop diarrhea.
Tea polyphenols have a very obvious killing and inhibiting effect on viruses. In medicine, people have used it to treat diseases such as influenza and dysentery, and the effect is very good.
Beauty can be beauty?
Green tea has the effect of beauty beauty. The main method is to wash your face with green tea, which can control oil, shrink pores and prevent skin aging.
refreshing
Tea contains a certain amount of caffeine, which can enhance the excitability of cerebral cortex, promote the nerve center to be in an excited state, and achieve the effect of clearing the heart and refreshing.
Protect teeth
Green tea is an alkaline drink containing a certain amount of fluorine, which can reduce the absorption of calcium by human body, so it has a good effect on preventing dental caries and protecting teeth.
The efficacy of green tea
1, reducing cardiovascular diseases
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.
2. 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.
3, beauty whitening
Green tea (tea itself) is ground into powder and used as a mask to clean skin, replenish water and control oil, dilute acne marks and repair skin damage.
In addition, green tea is rich in vitamin C and flavonoids, which can make the skin whiter.
Step 4 lose weight and fat
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. 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 green tea has bactericidal effect, which can prevent food residues from breeding bacteria, so it can effectively prevent bad breath.
A new study in Japan shows that drinking green tea can reduce the risk of myocardial infarction.
Many people have a soft spot for coffee, but few people realize some disadvantages of drinking too much coffee. Caffeine contained in coffee can excite the central nervous system, which is a great burden to the myocardium for a long time. A survey on coffee and heart disease in Boston, USA shows that excessive drinking of coffee may be one of the important causes of myocardial infarction. Compared with people who don't drink coffee at all, the proportion of people who drink 1-5 cups of coffee every day is 1.34 times that of people who don't drink coffee.
In sharp contrast, a new study in Japan shows that drinking green tea can reduce the risk of myocardial infarction. Subjects who drink one or more cups of green tea every day are much less likely to suffer from myocardial infarction than those who don't drink green tea. Studies have shown that drinking green tea regularly can play a protective role in preventing myocardial infarction.
Brewing method of green tea
There are many kinds of green tea, even the same green tea will have different brewing methods.
1, brewing green tea must fully show the green color and fragrance of green tea. Therefore, the water temperature when making tea, the proportion of tea, the length of soaking time and the choice of tea set should be well grasped.
2. Generally speaking, the ratio of tea to water is 1:50, which can best reflect the quality of tea. Too much water will weaken the taste, and too little tea will become bitter.
3. Because green tea is mostly picked with tender leaves or tea buds, the water temperature for making tea should not be too high. The suitable water temperature should be between 85 ~ 90℃. In addition, it is also related to the compactness of tea.
4. Tea should not be soaked for a long time, otherwise the tea tastes heavy and bitter. If the brewing method is proper, the brewed tea is bright green, light and sweet.
There are many kinds of tea sets for making tea, including modern glasses, traditional porcelain pots and sand pots. Glass has a sense of perspective, and you can see the green color of tea leaves, which has a good visual effect, but it is easy to burn your hands when holding the cup.
A tea bowl with a saucer is different. It will not burn your hands, and it is easy to retain the aroma of tea. It is recommended.
Method for make tea after wat
In order to observe the stretching degree of tea leaves, select a glass with a moderate size in advance, pour an appropriate amount of boiling water of about 80 degrees, then pour 3-5g of green tea, wait for the tea leaves to slowly sink, watch the green tea slowly stretch in the cup, and wait for the green tea to completely sink before drinking and tasting.
This method is mostly suitable for tender stir-fried green (such as super Longjing, super Biluochun, super Xinyang Maojian, Luan Guapian, old bamboo generous, etc.). ).
Brewing method of tender tea leaves
Put the tender tea into the cup and brew it with warm water for 2-3 minutes, mainly to wake up the tea and let the tea absorb water first and slowly stretch. Then pour boiling water at 85-95℃, so that the brewed tea is more fragrant and tastes better.
Tip: To brew green tea, we usually need to drink it 2-3 times before brewing it again. It's not easy to be too strong every time. Better drink more. Don't drink too much green tea at a time. People with bad stomachs are easily stimulated by green tea.
Green tea taboo crowd
1, hypertension, hyperlipidemia, coronary heart disease, arteriosclerosis, diabetes, overeating greasy, drunkenness.
2. Fever, renal insufficiency, cardiovascular diseases, habitual constipation, digestive tract ulcer, neurasthenia, insomnia, pregnant women, lactating women and children.
3, people with bad stomach should not drink green tea, green tea is cold, and people with bad stomach are prone to flatulence and other symptoms.
4, insomnia and dreaminess, pregnant women can not drink green tea, because the caffeine contained in green tea affects sleep.
5. Children should not drink green tea, because tannic acid in green tea will hinder the absorption of nutrients such as protein and fat, which will further lead to the fragility of bones and teeth and even cause children's allergies.
6, not suitable for people with fever, renal insufficiency, cardiovascular disease, habitual constipation, digestive tract ulcer, neurasthenia, insomnia and other symptoms.
7. Patients with hypoglycemia should use it with caution, because green tea can quickly lower blood sugar in a short time.
8. Patients with liver disease should avoid drinking green tea: caffeine and other substances in green tea are mostly metabolized by the liver. If the liver is sick, drinking too much tea will exceed the metabolic capacity of the liver and damage the liver tissue.
9. Anemia patients should not drink green tea. Tannic acid in green tea can combine with iron to form insoluble final compounds, which makes the body unable to obtain enough iron sources.
10, women should not drink green tea during menstruation: menstrual blood will consume iron in the body, and tannic acid in tea will hinder the absorption of iron in food.
1 1, which is not suitable for pregnant women. Caffeine in tea will increase the load on pregnant women's hearts and kidneys.
12, not suitable for lactating women. Tannic acid in tea affects breast blood circulation and inhibits milk secretion; You can't drink tea during menopause.
After reading this article, I believe everyone has a certain understanding of the benefits of drinking green tea, as well as the efficacy and brewing methods of green tea. In fact, green tea has many functions and benefits for human body. Drinking green tea in moderation at ordinary times can also prevent bad breath and beautify the face, which is very helpful.