Why do coffee drinkers feel more clear headed after consuming caffeine? Why do some get a headache without it? Does caffeine cause any permanent brain changes and can the brain go back to ‘normal’ after years of caffeine use?
In: Biology
Hi y’all,
This is what I like to call a ‘universal experience thread’. Almost everyone has had caffeine or knows someone who has. As a consequence of that ubiquity, threads like this tend to get a lot of anecdotal replies.
Here at ELI5 we try to maintain a focus on simplified explanations of complex concepts. Anything that isn’t an explanation under rule 3 can’t be a reply directly to the OP. That ensures that the sub reliably sees good explanations rise to prominence.
Keep in mind that replies to other comments don’t have that same standard applied to them.
Having a comment you spent time crafting removed is a negative experience. We like to give a little warning when we can to try to save some people from that.
[Here’s a link to the rules](https://www.reddit.com/r/explainlikeimfive/wiki/detailed_rules), which have recently been rewritten to be more informative/clear.
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