This was also a good lesson that if I continued to listen to the pop science, the general consensus was that coffee was a net positive.

And that was my stance for a long time.

I didn't realize that there could be such a distinction in one's reaction to caffeine intake.

"The genetics of caffeine sensitivity also have implications for cardiovascular health.

In a 2006 study of more than 4,000 people, researchers found that for slow metabolizers, consuming more cups of coffee per day was associated with an increased risk of a heart attack. Fast metabolizers had no such increased risks."