"The take home is that regular use of caffeine produces no benefit to alertness, energy, or function. Regular caffeine users are simply staving off caffeine withdrawal with every dose – using caffeine just to return them to their baseline. "
https://youarenotsosmart.com/2010/02/22/coffee/
I've read this years ago, forgot most of it and became a coffee addict again.
@koos I have read though that caffeine is neuroprotective and moderate regular users of caffeine experience onset and progression of neurodegenerative diseases of age more slowly.
@Tezcatlipoca does drinking coffee once a week or so count as moderate & regular? That would give all the benefits and none of the drawbacks!
@koos Sorry, looks like you need to really throw back several cups a day. But the effect seems to be real at least: https://www.sciencedaily.com/releases/2016/03/160304092010.htm
@koos I don't think so. Let me see if I can find it.