I tried that for a while, but for some reason, tea stains my teeth far more than coffee. A friend of mine actually told me about yerba mate. He's a big fan. Ho

I tried that for a while, but for some reason, tea stains my teeth far more than coffee. A friend of mine actually told me about yerba mate. He's a big fan. However, yerba seems to have some other biological interactions that I would have to research. I had cancer before, so phrases like "some experiments showed an increase in oral cancer cell proliferation" are a bit terrifying. Incidentally, caffeine itself may be cancer fighting. Caffeine is an mTOR inhibitor. mTOR has been implicated asa growth pathway in many cancers. If their are any bio-geeks on this site, I'd be curious to know what quantities are caffeine are comparable to a dose of rapamycin.