This reminds me of the best article I've ever read on caffeine: http://www.huffingtonpost.com/john-berardi-phd/coffee-health-benefits_b_3881377.html http://www.

This reminds me of the best article I've ever read on caffeine: http://www.huffingtonpost.com/john-berardi-phd/coffee-health-benefits_b_3881377.html http://www.huffingtonpost.com/john-berardi-phd/coffee-health.... TL;DR: There is an enzyme called CPY1A2 which determines if caffeine is bad or good for you.