Green tea is supposed to be good for you; researchers have found that compounds in the beverage may help suppress lung cancerand improve certain brain functions. However, drinking too much of the green stuff is not a good idea if you're not sure what else is in the teabag, according to report published in the journal BMJ Case Reports in October 2015. A 16-year-old girl in the U.K. learned this lesson the hard way when, after consuming about three cups of green tea a day for three months, she started to show symptoms of acute hepatitis, or inflammation of the liver. The girl had ordered the suspect tea online (after hearing claims it could help her lose weight). Most of the beverage's ingredients were in Chinese, so she wasn't sure exactly what was in the alleged "weight loss" beverage. Her doctors didn't analyze the exact chemical makeup of the tea, but once the girl stopped consuming it, her symptoms — which included jaundice, joint pain and dizziness — improved quickly.