In https://daringfireball.net/linked/2017/11/13/coffee-cardiova..., Gruber writes:

> I like that 5 cups of coffee per day qualified as “moderate”. That’s right around what I consume.

My immediate thought was "that's crazy, if anyone I know were to drink that much, he'd get mighty uncomfortable or even ill with shaky hands, a punishing heartbeat and heavy sweat". I told my colleagues. One replied and pointed out that the Americans dilute.

All the measurements in the comments so far are useless for drawing a conclusion. We should use milligrams of caffeine consumed and the body weight to have a sound basis for comparison.