I suppose green tea can help, but more in terms of general well-being- if we're comparing it to diet or medication, then I think the effects will be fairly negligible, or similar to the effects of drinking plenty of water. Still, it is a good addition to a healthy diet: we need to drink a lot, and green tea is one of the best drinks: it's mildly anti-inflammatory, and it's clean and refreshing, so it can help keep your kidneys flushed out. It has anti-oxidants, which supposedly helps with cholesterol. Also, like black coffee, they say it is good for your liver. It's good for fasting too, although again, black tea or coffee basically work the same.