What are the effects and functions of green tea? In China, the habit of drinking tea can be seen everywhere. Drinking different kinds of tea all year round can play a role in health preservation, and it is suitable for drinking green tea to cool off the heat in hot summer. Here I share the efficacy and function of green tea.
What is the efficacy and function of green tea? 1 1. Green tea can reduce fat and lose weight.
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 can delay 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 to prevent 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.
Dyspepsia and acute diarrhea caused by bacteria can be alleviated by drinking green tea.
6, green tea to prevent cancer
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 sunscreen
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.
Green tea can not only prevent cardiovascular diseases, but also reduce the deposition of cholesterol on the blood vessel wall and excrete cholesterol.
10, green tea can prevent influenza.
Green tea contains tea polyphenols. When people suffer from influenza, fruit acid is combined with influenza virus to reduce the infection and damage of virus to healthy cells.
Brewing method and technology of green tea
1. Tea set: Green tea is usually brewed in transparent glass, porcelain cup or tea bowl. Cups and bowls are all made of white porcelain, which is convenient for holding green tea and tea soup.
2. Water quality: The water quality of green tea is better. Usually choose clean and high-quality mineral water, and purified tap water is also acceptable. The pH value of water is neutral or slightly acidic. Do not use alkaline water and avoid dark tea soup.
3, water temperature: at first, you can boil the boiling water, so that the brewed tea is fresh and cold. The water temperature for making tea should be about 80 degrees. Because the chlorophyll of high-quality green tea is easy to be destroyed and turn yellow at high temperature, at the same time, the tea polyphenols in tea will be oxidized at high temperature, which will also turn the tea soup yellow, and many aromatic substances will quickly evaporate and disappear at high temperature, making the tea soup lose its fragrance.
4. The ratio of tea leaves to water: Generally, the ratio of tea leaves to water is 65,438+0: 50 to 65,438+0: 60 (that is, 50 ml to 60 ml of water is added to one gram of tea leaves), so that the brewed tea soup is moderate in color and fresh in taste.
5. Brewing technique: It is required to hold a kettle and fill the teacup with water. Adopt the gesture of "Phoenix nods three times", so that the injected hot water will urge the tea leaves to float up and down, and the tea juice will easily bubble out.
In addition, when brewing, a small amount of hot water is often injected to soak the tea leaves first, and then water is injected to the cup edge 1cm to 2cm. Most of the effective components in green tea have the largest leaching amount after the first brewing, and basically reach the total leaching amount after the third brewing. So green tea is usually brewed three times. Very delicate high-grade tea can generally be brewed twice.
Avoid people who drink green tea.
Pregnant women should avoid drinking tea, especially strong tea.
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 fetus develop normally and avoid excessive stimulation of caffeine to the fetus, pregnant women should drink less or not drink tea.
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 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 tea are metabolized by the liver. If the liver is sick, drinking too much tea exceeds the metabolic capacity of the liver, which will damage the liver tissue.
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.
Old people should not drink raw tea and green tea.
The so-called green tea refers to the green tea that is directly dried without kneading 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 upset 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.
What are the effects and functions of green tea? 2 1. Green tea is anti-aging.
Green tea contains antioxidants, which can effectively resist body aging. Because of the metabolic process of human body, if it is over-oxidized, it will produce a lot of free radicals, accelerate aging and cause harm to body cells.
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.
3. Green tea lowers blood fat
Scientists have proved through animal experiments that catechins in tea can effectively reduce total cholesterol, free cholesterol and cholesterol in density fat in plasma. And triglycerides. It can also increase high density lipoprotein cholesterol.
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.
Catechins contained in green tea can inhibit the action of cariogenic bacteria and effectively reduce the incidence of dental plaque and periodontitis. Monophosphoric acid contained in tea can not only sterilize, but also prevent the dregs in food from breeding bacteria, which 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.
Can you lose weight by drinking green tea
First, you need to wait for an hour after meals before drinking green tea, so that green tea will not affect the absorption of iron.
Second, drinking green tea every day should not exceed 1000 ml, otherwise it will cause iron deficiency anemia.
Third, the green tea diet is only suitable for obesity caused by slow metabolism. People with menstrual period, vegetarian diet, gastric ulcer and anemia are not suitable for drinking green tea to lose weight.
Green tea diet
First, Hakka broken tea
Prescription of slimming tea: green tea powder and coix seed.
Usage:
Put the green tea powder into a bowl, add some fried Coix lachryma-jobi powder (brown rice flour and soybean are also acceptable), add cream and mix well, and brew with hot water to drink.
Function: It can nourish the face, make the skin tender, and promote diuresis and reduce fat.
Second, dark-haired and energetic green tea
Prescription of slimming tea: 6g of green tea powder, 3 yuan of Polygonum Multiflori Radix, Alismatis Rhizoma and Salvia Miltiorrhiza Radix.
Usage: add seven bowls of water and fry them into two bowls of soup, with a paste every day.
Function: It can improve anemia, poor metabolism, edema and reduce fat.
Suitable crowd for green tea
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.
Although green tea is suitable for most people, we should pay special attention to it: because green tea can quickly lower blood sugar in a short time. Therefore, patients with hypoglycemia should use it with caution.
Conclusion: Green tea is a very healthy drink, especially suitable for middle-aged and elderly people, because it can effectively reduce dry blood pressure, hyperlipidemia, coronary heart disease, arteriosclerosis and other diseases in middle-aged and elderly people.
But also very suitable for people who often eat greasy food and people who often drink. But there are also some people with renal insufficiency and weak digestive tract. Moreover, lactating mothers and pregnant women and children are not suitable for drinking green tea. Pay attention to these parts.