I wake up frequently at night. Before I head for the bathroom, I look at the watch on my bed stand. The quick glance is not to tell me how long it has been since my last journey, but how much more time must elapse before I get to drink my first cup of coffee of the day. My day always begins with a cup of coffee. An hour later, I am ready to have a second cup. My third is consumed by mid-day – if not sooner. I always believed that drinking coffee was bad for me. First and foremost, there were the tedious trips to the bathroom. The embarrassing urge to relieve yourself always comes at the worst possible time, when the only bathroom on the outing is under lock or during a meal with a (much younger) date that you desperately want to impress with your health status. I figured, that coffee – at least in laboratory mice – increased the muscles in the diaphragm (which allows us to breathe) and in the legs (which need to...