This paper introduces the classification and drinking taboo of tea.

Tea is mainly divided into green tea, black tea, oolong tea, white tea, yellow tea, black tea and reprocessed tea.

green tea

Also known as non-fermented tea. It is made of suitable new tea buds through typical processes such as enzyme fixation, rolling and drying. According to the different ways of drying and deactivating enzymes, it is generally divided into frying, baking, drying and steaming. Green tea has the characteristics of "clear soup and green leaves, strong taste convergence".

Green tea is the earliest tea in history, more than 3000 years ago, and it is also the largest tea in China. Origin is mainly distributed in Zhejiang, Anhui, Jiangxi and other provinces.

Representative teas are West Lake Longjing, Xinyang Maojian Tea and Biluochun Tea.

black tea

Also known as fermented tea. It is made of tea suitable for making black tea, and refined through typical technological processes such as withering, rolling, fermentation and drying. Its soup color is mainly red, hence the name. Black tea can be divided into race black tea, Kung Fu black tea and red broken tea, which is the second largest tea in China.

The representative teas are Dianhong and Yixing black tea.

oolong

Also known as green tea, semi-fermented tea. It is a unique tea among several major teas in China. Oolong tea combines the production methods of green tea and black tea, and its quality is between green tea and black tea. It not only has the rich flavor of black tea, but also has the fragrance of green tea, and has the reputation of red edge and green leaves.

The pharmacological effects of oolong tea are manifested in decomposing fat, losing weight and building body. In Japan, it is called beauty tea and bodybuilding tea.

Representative teas include Wenshan Baozhong Tea, Anxi Tieguanyin Tea, Frozen Top Oolong Tea and Wuyi Dahongpao.

white tea

White tea is a kind of micro-fermented tea, which is a wonderful flower in China tea. Because its finished tea is mostly bud head, full of white hair and silver as snow, it is named.

The main producing areas are Jianyang, Fuding, Zhenghe, Songxi and other counties in Fujian Province (there is a small amount of production in Taiwan Province Province). The production technology of white tea is generally divided into two processes: withering and drying, and the key is withering. The preparation method of white tea is characterized by not destroying the activity of enzyme, nor promoting oxidation, but also maintaining aroma and refreshing taste.

The main varieties are Bai Mudan and Baihao Silver Needle.

Yellow tea

From the roasted green tea, it was found that the color of tea turned yellow due to insufficient or untimely drying after fixation and rolling, and a new category-yellow tea was produced.

Yellow tea belongs to fermented tea, and the production of yellow tea is similar to that of green tea, but the difference is that there is an additional boring process. This kind of stuffy pile technology is the main feature of yellow tea making method, and it is also the basic difference between it and green tea.

Yellow tea can be divided into three categories according to the tenderness of fresh leaves and the size of bud leaves: yellow bud tea, yellow small tea and yellow tea.

On behalf of tea, there are Mengding yellow buds and Huoshan yellow buds.

Dark tea

This is a unique tea with a long history of production in China. In the process of processing, fresh leaves turn black by heap fermentation, so it is called black tea. Black tea can be brewed directly or pressed into pressed tea (such as various brick teas). Location: Hunan, Hubei, Sichuan, Yunnan, Guangxi and other provinces. Because it is mainly sold to frontier areas, pressed tea made of black tea is also called edge-selling tea.

On behalf of tea, there is Pu 'er tea.

Reprocessed tea

Processed tea is a product made from the raw materials of basic tea such as green tea, black tea, oolong tea, white tea, yellow tea and black tea. Including scented tea, pressed tea, extracted tea, fruity tea and medicinal health tea, which have different tastes and functions respectively.

Representative tea: scented tea includes jasmine tea and Zhu Lan scented tea; Pressed tea includes Tuo tea and Liubao tea.

There is no doubt that tea plays a role in human health, but it also has different requirements for different people, so people in poor health should drink tea carefully. Mainly can be summed up as 3 1, as follows:

1. 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.

Beware of drinking tea because of neurasthenia.

Caffeine in tea can excite the nerve center. Drinking strong tea for neurasthenia, especially in the afternoon and evening, will cause insomnia and aggravate the condition. You can drink tea once in the morning and once in the afternoon during the day. It is better to drink scented tea in the morning, green tea in the afternoon and no tea at night. In this way, patients will be refreshed during the day, calm and comfortable at night, and can fall asleep early.

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.

5. 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.

6. Patients with peptic ulcer should drink tea carefully.

Tea is a stimulator of gastric acid secretion. Drinking tea can increase the secretion of gastric acid and stimulate the ulcer surface. Drinking strong tea often will worsen the condition. But for mild patients, you can drink some light tea after taking the medicine for 2 hours. Adding sugar black tea and milk black tea is helpful to diminish inflammation and protect gastric mucosa, and also has certain curative effect on ulcer. Drinking tea can also block the synthesis of nitroso compounds in the body and prevent precancerous mutation.

7. Avoid drinking tea because of malnutrition.

Tea has the function of decomposing fat. People who are already malnourished will be more malnourished if they drink tea to decompose fat.

8. Be careful when you are drunk.

Tea has the function of exciting the nerve center, and drinking strong tea after drunkenness will increase the burden on the heart. Drinking tea will also accelerate diuresis, so that toxic aldehydes in alcohol will be discharged from the kidneys before decomposition, which is very irritating to the kidneys and harmful to health. Therefore, for people with heart disease or poor function, don't drink tea, especially don't drink a lot of strong tea; For healthy people, you can drink a small amount of strong tea. When you wake up, you can eat a lot of fruit or sip vinegar to speed up human metabolism and relieve drunkenness.

9. Take medicine with tea with caution.

There are many kinds of drugs with different properties. Can you drink tea and take medicine? You can't generalize. Tannin and theophylline in tea can change chemically with some drugs. Therefore, when taking hypnotic sedative drugs, iron-containing blood-enriching drugs, enzyme preparation drugs, protein and other drugs, tea polyphenols are easy to react with iron and precipitate, so it is not appropriate to use tea to give drugs, so as not to affect the curative effect. Some Chinese herbal medicines, such as Herba Ephedrae, Ramulus Uncariae cum Uncis, Rhizoma Coptidis, etc., should not be mixed with tea. It is generally believed that it is not advisable to drink tea within 2 hours after taking the medicine. When taking some vitamin drugs, tea has no effect on the efficacy, because tea polyphenols in tea can promote the accumulation and absorption of vitamin C in the human body. At the same time, tea itself contains a variety of vitamins. Tea itself also has the functions of excitement, diuresis, blood lipid reduction and blood sugar reduction, which can improve the efficacy of the human body and restore health. In addition, people often think that it is not appropriate to drink tea when taking tonic such as ginseng antler, which is also reasonable.

10. Anemia patients should avoid drinking tea.

Tannic acid in tea can combine with iron to form insoluble final compound, which makes the human body unable to obtain enough iron source, so anemia patients should not drink tea.

1 1. Patients with urinary calculi should not drink 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.

12. Avoid drinking tea on an empty stomach.

Drinking tea on an empty stomach will dilute gastric acid, inhibit the secretion of gastric juice, hinder digestion, and even cause palpitation, headache, stomach discomfort, dizziness, upset and other "drunken tea" phenomena, and affect the absorption of protein, and also cause gastritis. If "tea drunkenness" occurs, it can be alleviated by taking candy or drinking some sugar water.

13. Avoid drinking a lot of tea before and after meals.

It is not advisable to drink tea for about 20 minutes before and after meals. If you drink tea, it will dilute the gastric juice and affect the digestion of food. Moreover, because tea contains oxalic acid, oxalic acid will react with iron and protein in food, which will affect the absorption of iron and protein by human body.

14. Avoid drinking tea before going to bed.

It is best not to drink tea within 2 hours before going to bed. Drinking tea will make you feel high, affect your sleep and even insomnia, especially the newly picked green tea. After drinking, the nerves are extremely excited and cause insomnia.

15. Avoid overnight tea.

You'd better drink tea at once. Tea leaves have been stored for a long time, which not only leads to the loss of nutrients such as vitamins, but also tends to be rancid and sick.

16. Avoid drinking the first tea.

Because modern tea is inevitably polluted by pesticides, fertilizers, dust and other substances in the process of planting, processing and packaging. The first sip of tea is actually the water for washing tea, so you should rush into boiling water as soon as possible, so that the tea brewed is the most hygienic tea.

17. Avoid drinking inferior or deteriorated tea.

Tea is not easy to keep properly, and it is easy to absorb moisture and become moldy, and some people are reluctant to discard moldy tea out of their love for saving tea. Deteriorated tea contains a lot of substances and germs harmful to human body, and it is absolutely inedible. If high-quality tea leaves are left for too long after soaking, the tea soup will also deteriorate due to oxidation and microbial reproduction, and such tea can no longer be drunk.

18. Children should not drink strong tea.

Because when the concentration of tea is high, the content of tea polyphenols is too high, which is easy to react with iron in food, which is not conducive to the absorption of iron and is easy to cause iron deficiency anemia in children. Children can drink some light tea in moderation (one-third of adult tea). For preschool children, you can drink some rough tea, because the content of tea polyphenols in rough tea is low.

19. Patients with coronary heart disease should drink tea cautiously.

For coronary heart disease patients with tachycardia, premature beats or atrial fibrillation, caffeine and theophylline in tea are stimulants, which can enhance the heart function. Drinking a lot of strong tea will make their hearts beat faster, which often leads to their illness or aggravation. Therefore, such people can only drink some light tea; On the contrary, patients whose heart rate is generally below 60 beats/min should drink more tea, which is not only harmless, but also can improve the heart rate, which has the effect of cooperating with drug treatment.

20. 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.

2 1. Patients with hypertension should not drink strong tea.

The amount of boiling water per gram of tea is less than 50 ml, which is called "strong tea". If hypertensive patients drink too much tea, the exciting effect of caffeine will lead to an increase in blood pressure, which is not conducive to health.

22. People with diabetes should drink more tea.

The symptoms of diabetics are hyperglycemia, thirst and weakness. Drinking tea can effectively lower blood sugar, quench thirst and enhance physical strength. Patients usually drink green tea, and the amount of tea can be slightly increased, and they can drink it several times a day. At the same time, they can also eat some pumpkin seeds or pumpkin food, which has a synergistic effect.

23. Drink light tea immediately after getting up in the morning.

Because after a day and a night of metabolism, the human body consumes a lot of water and the blood concentration is high. Drinking a cup of light tea can not only replenish water, but also dilute blood and lower blood pressure. Especially for the elderly, drinking a cup of light tea immediately after getting up early is good for health. Drinking light tea is to prevent gastric mucosal damage.

24. Drink more tea when you have diarrhea.

Diarrhea can easily dehydrate people, leading to sunken fingerprints. Drink more concentrated tea. Tea polyphenols can stimulate the gastric mucosa, absorb water much faster than simply drinking boiled water, and quickly replenish water to the human body. At the same time, tea polyphenols can kill bacteria and stop dysentery.

25. Drink tea after eating greasy food.

Most greasy foods are rich in lipids or protein, and it takes a long time to empty in the stomach, usually about 4 hours, so it is not easy to feel hungry after eating. If food stays in your stomach for too long, you will feel full and thirsty. At this time, if you drink some strong tea, the tea juice will form an emulsion with fatty foods, which is conducive to speeding up the discharge into the intestine and making the stomach comfortable. Ethnic minorities such as border areas mainly eat beef, mutton and dairy products every day. "A day without food is better than a day without tea" is the truth. In order to "reduce fat" when drinking tea, the tea can be properly soaked a little thicker, but the amount of hot tea should not be too much, otherwise it will dilute the gastric juice and affect digestion.

26. Drink tea after eating salty food.

Because eating too salty food will lead to high blood pressure, especially for patients with hypertension, and it is not advisable to eat too salty food. Too much salt in the body is harmful to the body, so you should drink tea as soon as possible to induce diuresis and discharge salt. Some pickled foods also contain a lot of nitrate. After eating, nitrate can easily react with secondary amines in other foods to produce nitrosamines, which are carcinogens. Drinking tea, especially high-grade green tea with high catechin content, can inhibit the formation of carcinogens and enhance immune function.

27. Drink tea after sweating.

Excessive physical labor can lead to a lot of sweating. People who work in high temperature and high heat environment will excrete a lot of sweat to regulate their body temperature. At this time, drinking tea can quickly replenish the water needed by the human body, reduce the blood concentration, accelerate the excretion of waste in the body, reduce muscle soreness and gradually eliminate fatigue.

28. Miners, X-ray doctors, computer workers, people who watch TV for a long time, and workers in print and copy shops should all drink tea. Because this kind of workers will be more or less exposed to certain radiation, and tea polyphenols contained in tea have certain anti-radiation effect, so drinking more tea is good for health.

29. Mental workers and night shift workers should drink tea.

Tea contains caffeine and so on, which has a refreshing effect. Therefore, writers, scholars and night mental workers drink more tea, which is conducive to improving thinking activities, enhancing memory and improving work efficiency.

30. Tea is suitable for speaking, telling stories and singing.

If you are engaged in voice work for a long time, you should always drink tea to moisten your throat to moisten your vocal cords and make your pronunciation crisp. It can also reduce congestion and swelling of your throat, prevent hoarseness and prevent pharyngitis.

Smokers and passive smokers should drink more tea.