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This is a good video that gives an overview of the health effects of coffee. This video essentially concludes that coffee is healthy, as long as it doesn't keep you up at night. I've also heard this from other sources, but the idea that coffee is bad for health is quite pervasive still.
I'd like to know more about caffeine with ADHD people, and stimulants generally, particularly because a lot of ADHDers (including myself) find coffee makes them sleepy/calm rather than restless and energised. Like what is going on there?
I have heard to avoid caffeine if you struggle with fatigue but again, maybe that's only if you have the typical reaction of feeling energised. The book why we sleep does acknowledge that there's a minority of the population that can sleep well despite caffeine. I *think* that's me but who knows, maybe sleep is affected even if I can keep sleeping?