Green tea, which originates in China but is now consumed all over the world, is made with pure leaves, and has undergone little oxidization during processing. Polyphenol content of green tea has antioxidant property that can help to prevent cancer.

Green tea also made 20% of drug-resistant bacteria susceptible to one of the cephalosporin antibiotics. These are important antibiotics that new drug resistant strains of bacteria have evolved to resist. There is also a suggestion that it can increase endurance in exercise by improving fat metabolism. But the actual benefits of drinking tea are not certain. Most research about tea’s benefits is based on epidemiological studies.

The researchers show that, tea acts at the cellular level by inhibiting inflammatory pathways to reduce inflammation, the study published in the open access journal BMC Medicine. They also said that, tea extracts reduce the interval of radiation-induced skin damage by up to 10 days in patients who received radiation treatment. Green tea extracts are more effective than black tea extracts in some patients of skin damage.

According to Dr Mervat Kassem from the Faculty of Pharmacy at Alexandria University in Egypt “We tested green tea in combination with antibiotics against 28 disease causing micro-organisms belonging to two different classes, in every single case, green tea enhanced the bacteria-killing activity of the antibiotics.”

Cardiovascular

Researchers have found that, the use of green tea rapidly improves the function of (endothelial) cells lining the circulatory system. Endothelial dysfunction is a key event in the progression of atherosclerosis. While black tea has been associated with improved short and long-term endothelial performance. Another study has already shown that green tea reverses endothelial dysfunction in smokers.

The evidence shows that regularly drinking green tea may reduce heart attack risk. But there is a contradictory fact on black tea consumption and heart attack risk reduction. It still needs further research to prove that, if drinking tea over long periods might positively affect cholesterol levels, blood pressure and atherosclerosis.

Cancer

The research claims that green tea polyphenol content has antioxidant properties that can help prevent cancer.  It still needs research whether regular black tea consumption influences cancer rates. Early lab tests with white tea indicate it may protect against colon cancer in particular but it requires more research.

Bone health

Previous studies have indicated that regular tea consumption might improve bone mineral density in older people. The recent research indicates that, green tea could be beneficial in reducing inflammation related to arthritis and slowing cartilage breakdown.

Memory

Recent studies found that old people in Japan who drank green tea daily showed reduced risk of memory complexity, than those who didn’t drink tea on a regular basis. While there is still much to study about benefits of tea, the possible benefits seem to be in the cup, not in supplements or tea extract capsules.

Dr Vlachopoulos says “Tea consumption has been associated with reduced cardiovascular morbidity and mortality in several studies. Green tea is consumed less in the Western world than black tea, but it could be more beneficial because of the way it seems to improve endothelial function. In this same context, recent studies have also shown potent anticarcinogenic effects of green tea, attributed to its antioxidant properties.”

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