Tea can prevent the increase of sterols in human body and prevent myocardial infarction. Tea polyphenols can also remove excessive free radicals, inhibit and kill pathogenic bacteria. In addition, tea has the functions of refreshing, eliminating fatigue and resisting bacteria. This is necessary for middle-aged people. Tea can also purify water quality and reduce the harm of radioactive substances to human body. Therefore, people living in cities should drink tea regularly, especially when the natural environment is seriously polluted. There are many benefits of drinking tea, which can be summarized as 14:

(1) Tea can refresh the mind and enhance the ability of thinking and memory.

(2) Tea can eliminate fatigue, promote metabolism and maintain the normal functions of the heart, blood vessels and gastrointestinal tract.

(3) Drinking tea is of great benefit to the prevention of dental caries. Children who drink tea regularly can reduce dental caries by 60%.

(4) Tea contains many trace elements beneficial to human body.

(5) Tea can inhibit malignant tumor, and drinking tea can obviously inhibit the growth of cancer cells.

(6) Drinking tea can inhibit cell aging and prolong life. The anti-aging effect of tea is more than 18 times that of vitamin e.

(7) Drinking tea can delay and prevent the formation of lipid plaque in vascular intima, and prevent arteriosclerosis, hypertension and cerebral thrombosis.

(8) Drinking tea can excite the central nervous system and enhance the ability.

(9) Drinking tea has a good slimming and beauty effect, especially oolong tea.

(10) Drinking tea can prevent senile cataract.

(1 1) Tannic acid contained in tea can kill many kinds of bacteria, so it can prevent and treat stomatitis, pharyngolaryngitis, enteritis, dysentery, etc.

Drinking tea can protect people's hematopoietic function. Tea contains anti-radiation substances. Drinking tea while watching TV can reduce the harm of TV radiation and protect your eyesight.

(13) Drinking tea can maintain the normal acid-base balance of blood. Tea contains alkaloids such as caffeine, theophylline, theobromine and xanthine, and is an excellent alkaline drink. Tea can be quickly absorbed and oxidized during the extraction process, resulting in high concentration of alkaline metabolites, thus neutralizing acidic metabolites in the blood in time.

(14) heatstroke prevention and cooling. After drinking hot tea for 9 minutes, the skin temperature drops 1-2 degrees Celsius, which makes people feel cool and dry, while after drinking cold drinks, the skin temperature drops slightly.

Reasonable drinking tea is beneficial to human body, while unreasonable drinking tea is harmful to human body.

Drinking tea depends on physical fitness. Chinese medicine believes that people's physique can be divided into dry heat and deficiency cold, and tea can be divided into coolness and warmth through different production processes, so it is also important to drink tea with different constitutions. People with hot and dry constitution should drink herbal tea, while those with deficient and cold constitution should drink warm tea.

It is best to drink black tea at night. Because green tea belongs to non-fermented tea, it has high content of tea polyphenols, maintains its original properties and is irritating; Black tea is a completely fermented tea. Although the content of tea polyphenols is low, it is mild after "aging" and suitable for drinking at night. Especially for people with weak spleen and stomach, adding some milk when drinking black tea can play a certain role in warming the stomach.

However, people who are easily excited or sensitive, have poor sleep and are weak should drink less or not drink tea at night. In addition, when drinking tea at night, you should put less tea leaves and don't make the tea too strong. It is best to drink tea after meals, because drinking tea on an empty stomach will harm your health, especially for people who don't drink tea often, it will inhibit the secretion of gastric juice, hinder digestion, and seriously cause palpitations, headaches and other "tea drunk" phenomena.

Eight misunderstandings of drinking tea

I like drinking new tea.

Because of its short storage time, new tea contains more unoxidized polyphenols, aldehydes and alcohols, which has a strong stimulating effect on human gastrointestinal mucosa and is easy to induce stomach diseases. Therefore, drink less new tea and avoid new tea that has been stored for less than half a month.

Second, drinking tea for the first time

Because tea is polluted by harmful substances such as pesticides in the process of planting and processing, there will always be some residues on the surface of tea, so the first-time tea should be discarded because of its washing function.

Third, drink tea on an empty stomach.

Drinking tea on an empty stomach will dilute gastric juice, reduce digestive function, increase water absorption rate, and lead to a large number of bad components in tea entering the blood, causing dizziness, palpitation, weakness of hands and feet and other symptoms.

Fourth, drink tea after meals.

Tea contains a lot of tannic acid, which can react with iron in food to form new substances that are difficult to dissolve. Over time, it will cause iron deficiency and even induce anemia. The correct way is to drink tea an hour after meals.

Five, have a fever to drink tea.

Tea contains theophylline, which can raise body temperature. Drinking tea for patients with fever is tantamount to "adding fuel to the fire".

Six, patients with ulcers drink tea

Caffeine in tea can promote gastric acid secretion, increase gastric acid concentration, induce ulcers and even perforation.

Seven, drinking tea during menstruation

Drinking tea during menstruation, especially strong tea, will induce or aggravate menstrual syndrome. Medical experts have found that compared with people who don't drink tea, people who have tea habits are 2.4 times more likely to have menstrual tension, and those who drink more than 4 cups of tea a day are 3 times higher.

Eight, unchanged

The climate is different all year round, and the types of tea should be adjusted accordingly. It is advisable to drink scented tea in spring, which can disperse the cold evil accumulated in the body all winter and promote the hair growth of human yang; It is advisable to drink green tea in summer. Green tea tastes bitter and cold, and it can clear away heat and relieve summer heat, detoxify, enhance gastrointestinal function, promote digestion, prevent diarrhea and skin boils infection. Green tea should be drunk in autumn. Green tea is neither cold nor hot, which can completely eliminate the residual heat in the body, restore sweetness and warmth, and make people feel refreshed; It is advisable to drink black tea in winter, which is sweet and rich in protein and has a certain nourishing effect.

Disadvantages of women drinking tea:

Women who love to drink green tea should pay attention.

Drinking more tea can promote food digestion and refresh the mind, so teahouses are opened one after another, but tea can't be drunk every time, especially female friends should pay special attention to avoid deterioration! The periods when female friends are not suitable for drinking tea are divided into:

1. Every month when the physiological period comes. Because menstrual blood will consume a lot of iron in the body at this time, female friends should add more vegetables and fruits rich in iron, such as spinach, grapes and apples. However, if you are used to drinking tea when you are full, this kind of tea contains as much as 50% tannic acid, which will hinder the absorption of iron by our intestinal mucosa and greatly reduce the absorption of iron, so it is easy to precipitate iron in the intestine and chyme or iron stone in blood-enriching drugs.

2. Pregnant women are not suitable for drinking tea during pregnancy. Generally, the concentration of caffeine contained in strong tea is as high as 10%, which will increase the times and frequency of urination and heartbeat of pregnant women, increase the load on their hearts and kidneys, and more easily lead to pregnancy poisoning, so it is better to drink less tea.

Pregnant women should not drink too much tea before giving birth. If you drink too much strong tea before giving birth, the caffeine in the tea will have an exciting effect and lead to insomnia. If pregnant women don't get enough sleep before delivery, it may lead to exhaustion and even dystocia during delivery.

Mothers who want to breastfeed themselves just after giving birth should not drink too much tea. Because if you drink a lot of tea during this period, the high concentration of tannic acid in tea will be absorbed by mucosa, which will affect the blood circulation of breast and inhibit milk secretion, resulting in insufficient milk secretion.

After the mother drinks the tea, the caffeine in the tea will penetrate into the milk, indirectly affecting the baby, which is not good for the baby's health.

6. In addition to dizziness and fatigue, menopausal women sometimes have an accelerated heartbeat, so they have a bad temper and poor sleep quality. If they drink too much tea, these symptoms will get worse. Therefore, if people who like drinking tea are at these special stages, it is best to stop, so as not to ruin their health!