Green tea has been proven to have remarkable health benefits because it's rich in antioxidant
polyphenols known as catechins, as well as l-theanine which has a calming effect.
Black tea is green tea that has been oxidized and fermented, a process that destroys most of the beneficial catechins ; theanine. In a sense, black tea is green tea that is spoiled. See http://bit.Ly/17jtwfa for more info.