1. Studies show that green tea has been used as a medicine in China for at least 4,000 years.
2. Research [at University of Purdue] has shown that green tea contains a compound which inhibits the growth of cancer cells, without harming healthy tissue!
3. It is very high in catechin polyphenols, namely epigallocatechin gallate (EGCG) which is a powerful anti-oxidant.
4. It has proven effective in lowering LDL cholesterol levels, and inhibiting the abnormal formation of blood clots. The latter is the leading cause of heart attacks and stroke.
5. Green, oolong, and black tea are from the same plant, called Camellia Sinensis. Green tea is different due to it's processing, which consists of boiling the leaves, instead of fermenting them. The boiling process allows the EGCG to oxidize, whereas the fermenting process converts the EGCG into other compounds which have proven considerably less useful.
6. The only harmful side effect is possible insomnia due to caffeine levels. However, green tea contains contains 20mg of caffeine (per 8 oz), whereas coffee contains 60-120 mg.