Coffee is like a drug. It's a stimulant. Anything that artifically stimulates you is unhealthy, in my opinion. And I believe that most medical studies show that coffee in any quantity is not good for you. There are always medical studies showing the opposite conclusion for any food or drink. You have medical studies showing that saturated fat and cholesterol do not affect health, but the vast majority of medical studies show that they do very much affect health. So people just have to draw logical conclusions.