Sometimes too much of a good thing becomes a bad thing — such is the case with espresso. If you’ve ever used caffeine to stay up late, you know that unhealthy jittery feeling you get after a while. So when should you stop?
The European Food Safety Authority recently released a study stating that for healthy, non-pregnant adults, 400 milligrams of caffeine per day is perfectly safe. That works out to somewhere between four and five espresso shots.
Keep in mind though that these are standard shot sizes. Many American cafes serve only double shots; if you’re concerned about your health, remember to factor that into account.