One of my friends has stomachache lately,especially when she eats something cold, we call it cold in stomach in TCM, and was told that she should nourish her stomach well. As you may know, Green tea is non-fermented tea, which results its character of cold; Tie Guan Yin is cool because it is light fermented tea; Rock oolong is neutral, and suitable to most people due to its half-fermented processing. And full fermented teas, like black tea, dark tea and ripe puer, are warm