One minute coffee is good for you, the next, it’s bad.
Coffee is a carcinogen according to the World Health Organization (as is processed red meat). However, a Harvard study conducted on over 200,000 doctors and nurses found that the more coffee (decaf included) they consumed, the lower their risk of death. Researchers also found that drinking more coffee lowered their risk of mortality due to cardiovascular disease, Parkinson’s, suicide, stroke and type 2 diabetes.
But don’t get too excited unless you’re a white healthcare professional. The population was predominantly (95%) Caucasian and comprised entirely of medical and health professionals so the results may not be generalizable to other populations.
Unfortunately, coffee and smoking often go hand in hand, but their effects do not cancel out. Also, we don’t all metabolize caffeine in the same way and too much of the stuff can lead to sleep deprivation and insomnia.
Finally, let us not forget that this study elucidated an association and does not prove causation.