Why Green Tea?

I recently was watching a show on television and the celebrity doctor was telling the audience about using green tea. He was making claims even though the jury is still out on whether all the purported health claims have any merit. Apparently you would need to drink many, many cups to maybe get some benefits. They have extracts and pills which defeat the purpose if you believe in getting your nutrients from your diet. It becomes another supplement. It almost seems like green tea is a separate plant than black tea or white tea. People have been drinking tea for a long time yet all of a sudden all you hear is about the marvels of green tea. White, green, oolong and black tea are from the camellia sinensis plant. White tea is made from young leaves before they are fully opened and do not have the grassy taste green tea has. All the teas are said to have various antioxidants and more studies are being done on them. But with all the green tea marketing, black tea is the least expensive. Black tea due to being fermented keeps its flavor much longer than the white and green. So if you stock up on food that would be a concern. I personally like black tea, I don't drink enough for it to be a health drink if any of the claims are true. I won't substitute it for vegetables.