Green tea is a very powerful anti-oxidant. It is much more powerful (up to 200 times) than other anti-oxidants like vitamin C and E.
Drinking green tea also aids weight loss by increasing your metabolic rate. Your metabolic rate is that rate at which your body processes food. If you have a higher metabolic rate your body burns food faster and uses more calories doing so. Increasing your metabolic rate is an essential part of weight loss.