“We Japanese drink green tea every day, and I think that this green tea cannot prevent every cancer, but it is the cheapest and most practical method of cancer prevention available to the general public.”
-Dr. Hirota Fujiki
History: Chinese Emperor Shen Nung is credited with introducing green tea to the masses in 2737BC, and Traditional Chinese Medicine (TCM) has recommended green teaconsumption for good health since 1100BC. In 1191, a Japanese priest named Esai took some C. sinensis seeds to Japan for medicinal purposes, later writing a book entitled “Maintaining Health by Drinking Green Tea.”
Varieties: All teas originate from the C. sinensis plant. Harvest season, environmental conditions, plant age, processing, and storage are some of the factors that influence the wide variety of products available today. Black tea is the most oxidized, followed by oolong, green, and lastly, white.
Scientific Research: Green tea represents a perfect example of how science has come full circle, to support the medicinal wisdom of ancient folk tradition.
Studies supporting the health benefits of tea are abundant:
How much do I need?
Research  shows that three to four 8 oz. cups of green tea per day is the ‘sweet spot’ for cancer prevention and heart disease. According to research [], one cup of green tea is equivalent to about 20-35mg of EGCG.
Black, green, or white?
White tea is the least processed, and has a milder flavor compared to green and black teas. One study  compared Exotica China white tea with Premium green tea brewed for 1-5 minutes, and found that Exotica white outperformed Premium green for its anti-cancer properties. If you prefer to stick with green tea, consider sencha or matcha which have been shown to contain larger concentrations of active polyphenols.
Green and black teas contain L-theanine, which has been shown to help calm an anxious mind. It also selectively lowers elevated blood pressure, while having no effect on normal blood pressure levels. Green tea has also been studied  as an effective weight loss tool; helping to suppress appetite, and increase metabolism. Both green and black teas have the potential to prevent cavities. Darker teas are also higher in theaflavins which have been shown to help lower blood cholesterol.
Lighter teas are higher in immune modulating catechins, while darker teas are richer in mood-enhancing, heart protective compounds:
Can I take a supplement?
I recommend experimenting with a variety of organic green and white tea varieties before resorting to a supplement. Try as we might to isolate what we consider to be “only the good parts” of a plant in a lab, nature is wiser still. Studies  confirm that the constituents in the whole plant work synergistically to optimize its beneficial effects. You’ll also save a lot of money this way!
Click here to hear my enlightening interview with Art of Tea’s Steve Schwartz, and consider making their 8-Minute Digital Detox Challenge a part of your daily ‘me time’ teatime ritual!
How can I avoid the concentrated amounts of aluminum and fluoride that have been making their way into tea leaves?
4- http://www.puriku.com/download/Potent antimutagenic activity of white tea in comparison with green tea in the Salmonella assay.pdf