Here’s a list of some of its amazing benefits — benefits that you may not have been aware of. Some of these benefits are still being debated, so please do your own research if you want to use green tea for medicinal purposes.
1. Weight Loss. 促进新陈代谢，降低体重
Green tea increases the metabolism. The polyphenol found in green tea works to intensify levels of fat oxidation and the rate at which your body turns food into calories.
2. Diabetes. 调节血糖水平，防止糖尿病
Green tea apparently helps regulate glucose levels slowing the rise of blood sugar after eating. This can prevent high insulin spikes and resulting fat storage.
3. Heart Disease. 预防心脏病
Scientists think, green tea works on the lining of blood vessels, helping keep them stay relaxed and better able to withstand changes in blood pressure. It may also protect against the formation of clots, which are the primary cause of heart attacks.
4. Esophageal Cancer. 降低患食道癌的风险
It can reduce the risk of esophageal cancer, but it is also widely thought to kill cancer cells in general without damaging the healthy tissue around them.
5. Cholesterol. 调节高密度胆固醇与低密谋胆固醇的比例，降低坏胆固醇
Green tea reduces bad cholesterol in the blood and improves the ratio of good cholesterol to bad cholesterol.
6. Alzheimer’s and Parkinson’s. 可对抗老年痴呆和帕金森病
It is said to delay the deterioration caused by Alzheimer’s and Parkinson’s. Studies carried out on mice showed that green tea protected brain cells from dying and restored damaged brain cells.
7. Tooth Decay. 含有抗氧化成分，能保护牙齿
Studies suggests that the chemical antioxidant “catechin” in tea can destroy bacteria and viruses that cause throat infections, dental caries and other dental conditions
8. Blood Pressure. 降低血压
Regular consumption of green tea is thought to reduce the risk of high blood pressure.
9. Depression. 缓解低落情绪
Theanine is an amino acid naturally found in tea leaves. It is this substance that is thought to provide a relaxing and tranquilizing effect and be a great benefit to tea drinkers.
10. Anti-viral and Anti-bacterial. 具有抗菌性和抗病毒性，可对抗流感等多种疾病
Tea catechins are strong antibacterial and antiviral agents which make them effective for treating everything from influenza to cancer. In some studies green tea has been shown to inhibit the spread of many diseases.
Green tea can apparently also help with wrinkles and the signs of aging, This is because of their antioxidant and anti-inflammatory activities. Both animal and human studies have demonstrated that green tea applied topically can reduce sun damage.
These are some of the many benefits but the reality is one cup of tea a day will not give you all the abundant gains. The jury is out on how many cups are necessary; some say as little as two cups a day while others five cups — and more still say you can drink up to ten cups a day. If you are thinking of going down this route, you may want to consider taking a green tea supplement instead (it would keep you out of the bathroom).
Another thing to point out is that there is caffeine in green tea — so if you are sensitive to caffeine then one cup should be your limit. Green tea also contains tannins (which can decrease the absorption of iron and folic acid), so if you are pregnant or trying to conceive then green tea may not be ideal for you.
For the rest of us with all these abundant benefits…it’s a wonder we drink anything else.