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Two sounds can be tea, and together they are tea.

Tea, botanical name: tea tree? Ketze. Shrub or small tree with hairless shoots. Leaves leathery, oblong or oval, blunt or sharp at the top, wedge-shaped at the base, shiny on the top, hairless or initially pilose on the bottom, serrated at the edge, and glabrous on the petiole.

Flowers are white, and sometimes the stalks are slightly longer; Sepals broadly ovate to rounded, glabrous, persistent; Petals broadly ovate, slightly articulated at base, glabrous on back, sometimes pubescent; Ovary densely covered with white hairs; Style glabrous. Capsule 3 is spherical or 1-2, with a height of1.1-0/.5cm, and each ball has 1-2 seeds. The flowering period is from June 10 to February of the following year.

Wild species are all over the mountainous areas of the provinces south of the Yangtze River in China. They are small trees with big leaves, usually more than 10 cm long. For a long time, after a lot of cultivation, great changes have taken place in hair and leaf shape. Tea can be used as a beverage, which contains many beneficial ingredients and has health care function.

2065438+0710127 October, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization was preliminarily sorted out for reference. Tea is in the list of three types of carcinogens. It is a substance suspected of causing cancer to human beings, and there is no sufficient human or animal data.

Health care function:

Can reduce the risk of cardiovascular and cerebrovascular diseases and death; According to research reports, Japanese researchers have followed up more than 40,000 middle-aged and elderly people aged 40 to 79 in a certain place since 1994. Compared with people who drink less than 1 cup of tea every day, the average risk of death from cerebrovascular diseases in men who drink more than 5 cups of green tea every day has decreased by 22%, while in women it has decreased by 3 1%, with the most obvious decline in cerebral infarction and 42% in men.

Has the function of lowering cholesterol and blood pressure; Researchers at the University of Hong Kong have found that drinking tea can reduce blood total cholesterol levels by 25%. Another survey on the relationship between drinking tea and the incidence of hypertension found that the incidence of hypertension was 10.55% for people who didn't drink tea, and 6.95% for people who drank tea regularly. Tea does have a certain antihypertensive effect.

Helps reduce the risk of diabetes; Long-term follow-up observation of 1.7 thousand men and women aged 40 -65 found that people who drink more than 6 cups of green tea every day have a lower risk of diabetes than those who drink less than 1 cup every week. There are also data showing that drinking cold boiled green tea is more effective in preventing and treating diabetes.

Helps to prevent and treat Alzheimer's disease; Tea has protective effect on brain cells. Tea can effectively delay brain degeneration and help maintain cerebrovascular health. The latest research shows that drinking more tea can improve memory and prevent Alzheimer's disease.

Has anti-stress and anti-anxiety effects; Modern life and work are fast-paced and stressful, which often causes psychological symptoms such as anxiety, tension, irritability and depression. Green tea contains theanine, which is a relaxant with no sedative effect and can help the brain increase the production of gamma waves. Gamma wave can help control anxiety, improve attention, improve mental state and overall function. Generally, 3-4 cups of green tea can contain 65,438+000-200mg of theanine, which makes green tea have better effects in anti-stress and anti-anxiety.

Can improve immunity; Researchers at Harvard University pointed out that people who drink five cups of tea every day for two weeks will produce a large amount of antiviral interferon, which is 10 times that of people who don't drink tea. This anti-infective protein can improve human immunity and effectively help people resist influenza.

Can improve the bactericidal power; In May 2008, it was reported that some scholars in Egypt tested 28 kinds of germs with "green tea plus antibiotics". The results show that green tea can greatly improve the antibacterial effect, and the highest sterilization efficiency can be increased by more than 3 times. But also can reduce the drug resistance of various bacteria.

Have slimming effect; The researchers found that compared with people who don't drink tea, people who drink tea for more than 65,438+00 years lose about 20% of body fat in men and 30% in women. Drinking tea and losing weight is a wonderful thing! Not only that, tea is also a beauty agent, which has a good protective effect on the skin, and people who drink more tea are also beautiful.