Coffee is so amazing, its both beneficial and detrimental to your health.

It both gives you cancer: http://www.timesonline.co.uk/tol/news/uk/article788739.ece
And reduces the risk of cancer: http://www.foxnews.com/health/2010/05/26/coffee-just-plain-good/ http://www.beliefnet.com/Health/2009/05/Hidden-Health-Secrets-of-Coffee.aspx?p=3

It gives you diabetes: http://health.msn.com/health-topics/diabetes/articlepage.aspx?cp-documentid=100240998
and saves you from diabetes: http://www.sciencedaily.com/releases/2011/01/110113102200.htm

It makes you depressed: http://www.thedailymind.com/health-at-work/foods-that-make-you-stressed-anxious-and-depressed/
And increases happiness: http://www.philstar.com/article.aspx?articleid=521848

It saves you from Alzheimers: http://www.beliefnet.com/Health/2009/05/Hidden-Health-Secrets-of-Coffee.aspx?p=2

But you will be angry: http://answers.yahoo.com/question/index?qid=20080816141324AA3zgOl

And its good for your heart: http://www.telegraph.co.uk/health/healthnews/7837800/Tea-and-coffee-reduce-heart-disease-risk-study-suggests.html

So there you have it. The worst and the best thing you can do, according to loads of valid medical research, is go down a cup of Joe. Get to it.

But its also bad for your heart: http://www.webmd.com/mental-health/news/20020801/is-caffeine-bad-for-your-heart