Is coffee good or bad for you? That may depend on your genes

[http://dummy.us.eu.org/robert (Robert)]

https://www.cbc.ca/radio/whitecoat/the-dose-coffee-health-1.6830562

I didn't realize that the effect of caffeine wears off, that its ability
to keep you stimulated fades quickly.  I guess that's why there are
diminishing returns when using it to keep you awake.