Coffee must be one of the most-studied substances on earth. There are no end of articles and studies claiming to provide proof that coffee is good for this or that, or bad for the other. Often these claims are in direct conflict with each other, so we still don't really know if it's good for you or bad for you on balance. Most people probably have a vague idea that it's slightly bad for you, but not so bad that you need to give it up (maybe just limit it a bit). And that may be just about right.
While it's pretty much uncontested that coffee, and specially caffeine, stimulates the central nervous system and increases alertness, there is also some pretty convincing evidence that coffee is also good for long-term brain health and cognitive function and as protection against dementia.
A recently-published large longitudinal study and meta-analysis out of Harvard suggests that a daily intake of two to three cups of caffeinated coffee or one to two cups of tea have a protective effect on the brain and result in statistically-significant reduced dementia risks and improved cognitive function. Decaffeinated coffee had no such benefits. Note that these are just observational studies, and so can only uncover associations and not definitive proof, but they are consistent with many previous studies and meta-analyses.
So, unless you suffer from caffeine sensitivity or acid reflux or are excessively prone to sleep disruptions, go ahead have a couple of cups of java (or tea). Don't get carried away, of course, but equally don't be swayed by some of the reports of coffee's more iniquitous effects.
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