More people are helping themselves to a second cup of green tea because of the potential health benefits of this popular drink. The diseases that green tea could benefit continue to grow - although most studies have been done in animals and need more confirmation in humans. Still, if you enjoy the taste you can revel in the fact that you may also be getting health benefits when you sip your morning cup of tea. Despite its healthy reputation, not everyone tolerates green tea well - especially when it's drunk in large amounts. What are the side effects of drinking green tea and is there anything you can do to prevent them?