Is coffee good for you or bad for you?

If ever there was something akin to demonstrating the Mendella Effect, the health impact of coffee is right up there with the best of them.

I remember coffee is hard on your heart and causes colon cancer, but somehow colas were not. Now we hear coffee is good for you, and you'll live longer if you drink 4 cups a day. And avoid the colas. They're now the ones that will hasten your death.

Such a clickbaity title. tl;dr: genetics influences how much coffee you consume. Unsure if coffee is good/bad.