Not that this information actually means anything to the addict, but it appears that not only is the modest imbibing of coffee not harmful, caffeine may actually help you live a longer life. Back when coffee was being panned as unhealthy by really unhappy people, the Phactor figured that the people who didn't drink coffee didn't really live longer; it was just that their miserable existence seemed longer. One does wonder about all the factors involved. Perhaps the socializing in the convivial company of coffee house patrons improves your outlook on life, which in turn provides a positive impact on your health, if only everyone didn't talk so fast. But even if such studies did not exist, a true caffeine addict is not easily guilted into quitting their morning upper. Such a study also should not be used as an excuse for over indulgence so as to increase your chances of living to 120. So, to Mr. 4 shots, straight up, you're probably near the limit. HT to Scientific American blog. And a wag of the finger for their stupid commercial delay. None of that stuff here, folks!