Benefits:
Because 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. EC can also purify water 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. A survey in Britain shows that children who drink tea regularly can reduce their 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 exercise 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. ?
Disadvantages:
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 dry and hot 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.
References:
Encyclopedia-drinking tea