alt Hacker NewsThis was my immediate thought. Very small amounts of daily coffee have caused me significant problems with fatigue etc... Takes 1-2 months to get back to feeling good. Strongly urge anyone who feels tired, lack of focus etc to stop all caffeine intake. As with any drug, you're just chasing the initial boost, and really only getting yourself back to baseline.
Yeah. I asked because I had my own heap of problems with caffeine and even with decaf coffee. This thing is a pile of random bioactive substances that are mostly fine for most people until they aren't.
What you could get away with in your twenties doesn't go unpunished once you're around thirty. And what you could get away with around thirty doesn't go unpunished once you're around forty.