Tea is a healthy and delicious drink. Whether it is green tea, black tea, oolong tea or white tea, it has many health-care functions. China began to drink tea thousands of years ago. In order to let more people know and understand the benefits of tea, this paper mainly discusses the influence of tea on health.

I. Types and characteristics of tea

There are many varieties of tea trees because of different growing environments. Common tea varieties are green tea, black tea, white tea, yellow tea and oolong tea. The following is to introduce the health care function of different kinds of tea from their characteristics.

1. green tea: it is unfermented tea with green leaves, yellow-green soup and fragrant smell. Green tea is rich in catechins, tea polyphenols, amino acids and other components, and has the functions of clearing away heat and toxic materials, reducing blood fat and losing weight, and preventing cardiovascular diseases.

2. Black tea: It is a fully fermented tea with reddish-brown leaves, bright red soup color and strong smell. Black tea is rich in solanine, theaflavins, catechins and other ingredients, which has the functions of refreshing the brain, reducing blood fat and protecting the heart.

3. White tea: it is unfermented or slightly fermented tea with gray leaves, yellowish or colorless soup and fragrant smell. White tea is rich in tea polyphenols, catechins and other ingredients, and has the functions of clearing away heat and toxic materials and resisting oxidation.

4. Yellow tea: special processing after micro-pressure and micro-fermentation. Leaves are yellow-green, soup is yellow-green, and it has a unique fragrance. Yellow tea contains theaflavins, catechins and other ingredients, and has the functions of promoting digestion, regulating gastrointestinal function, resisting oxidation and reducing halitosis.

5. oolong tea: it is a semi-fermented tea, which is between green tea and black tea. Its leaves are blue-brown, its soup is golden yellow, and its fragrance is fragrant. Oolong tea contains catechins, caffeine, tea polyphenols and other ingredients, which have the functions of helping sweating, relieving fatigue and refreshing, and preventing radiation.

Second, the impact of tea on health

1. Tea has the effect of losing weight.

Both catechins and tea polyphenols contained in green tea may reduce fat intake and absorption, thus helping the body lose weight. In addition, drinking green tea can also improve the metabolic rate of the human body and promote the burning of fat, thus achieving the purpose of losing weight.

2. Tea can lower blood pressure.

Tea polyphenols and catechins in tea can dilate blood vessels to some extent. For patients with hypertension, drinking tea can reduce the contraction of blood vessels, thus lowering blood pressure.

3. Tea has antioxidant effect.

Tea contains a lot of catechins and polyphenols, which have strong antioxidant effect, can remove toxic substances and protect the body from free radicals.

4. Tea has the function of protecting cardiovascular health.

Tea polyphenols and catechins in tea can reduce the hardening degree of human blood vessels, thus reducing the incidence of cardiovascular diseases. In addition, drinking tea can also reduce the contents of cholesterol and triglycerides in human blood, thus protecting heart health.

5. Tea can relieve fatigue.

Caffeine and theanine in tea can stimulate the central nervous system, improve the metabolic level of human body, make the body more active, and thus relieve fatigue.

Third, the drinking method of tea

When drinking tea, you need to pay attention to some precautions. The following will introduce the drinking time, cooking methods and preservation methods.

1. drinking time: drinking tea in the morning can improve people's vitality and memory, drinking tea at noon can help digestion and reduce fever, and drinking tea at night can help relieve sleep problems.

2. Cooking method: Different kinds of tea need different cooking methods. Generally speaking, white tea and yellow tea need low water temperature, black tea and oolong tea need high water temperature, and green tea needs moderate water temperature, generally around 80℃.

3. Preservation method: Tea leaves need to be stored in a dry, ventilated and cool place, preferably in an iron pot or an earthenware pot, so as to avoid the deterioration of tea leaves due to moisture.

Four. conclusion

Tea is a healthy drink, which can improve health and relieve fatigue, but excessive drinking of tea may also bring negative effects. Therefore, when drinking tea, it is recommended to do what you can, choose the type, quantity and time of drinking tea according to your physical condition and preferences, drink tea reasonably and enjoy health.