Green tea is now one of the most popular health drinks around. It is now widely available commercially. Green tea is one of three main types of tea, along with oolong tea and black tea. These three types of tea differ based on their oxidation levels. While black tea is fully fermented and oolong tea is partially fermented, green tea is only steamed, pan heated, or baked, thus preventing full oxidation. This is why the leaves are still green. But what difference does green tea really make for our health?