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Dr. Andrew Weil says, "On the down side are coffee's well-documented side effects: anxiety, insomnia, tremor and irregular heartbeat. It can also irritate the digestive system, bladder and prostate."

http://www.drweil.com/drw/u/QAA400146/Is-Coffee-Good-For-You...

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There's also a lot of interesting data coming up mildly positive on Caffeine health benefits in the literature.

http://www.ncbi.nlm.nih.gov/pubmed?term=caffeine%20cancer http://www.ncbi.nlm.nih.gov/pubmed/21907331 http://www.ncbi.nlm.nih.gov/pubmed/19581722

Moderate caffeine intake is on track to be firmly in the green for most people. However, not everyone metabolizes and reacts to it identically, so the author of the article in question may be one of those people who does not get a lot of benefits.

But there is this funny idea floating around that caffeine is carcinogenic and long-term use may cause cognitive impairment, and there is very little evidence for that.

I realized as soon as I posted that I could just google it. But the guy did a good job explaining the underlying science between caffeine highs, I would have liked him to explain the negatives as well.

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