I am fond of traditional Japanese green tea. Jasmine tea is lovely as well. No sweetener added, I think it would wreck the subtle flavours. But I suppose green tea may be an acquired taste.

I find green tea very diuretic and I need to make extra trips to the WC and increase my water intake to make up for it. Green tea does seem to help with my weight loss though. Whenever I drink at least 3 cups a day the scales soon report a favourable result.