Age article today covering research in Japan on 90000 people showing positive health effects of 2-5 cups per day.

Good read, here is a quote
"Many are keen to seek chemical explanations for epidemiological results. Research like the Japanese study over the past couple of years has shown apparent links between drinking several cups daily and a reduced risk of, among other things, multiple sclerosis, liver cancer, dementia, skin cancer, breast cancer, heart disease, cerebrovascular disease, respiratory disease, colourectal cancer, and type 2 diabetes.

Take that with a grain of salt maybe but at least there aren't any studies showing is bad for you.