The best tea you can drink is green tea. I try to get at least to cups a day, non-sweet but with a lil fruit on the side.
Here are some good facts about green tea.
Aids in weight loss (just aids) by bumping up your metabolsm
Full of antioxidents that help fight off cancer cells
Been shown to help thyroid function
Now you can't just drink green tea and wham...however its a great staple to a healthy diet and workout program.