I used to work at coffeeshops, and in four or five years, I never noticed any correlation between coffee consumption and good health (my own or that of coworkers and customers). I wasn’t doing any formal studies, naturally, but it seems like it would be a fairly well-known phenomena, if there was strong causality.
I’d be careful with decaf coffee, if you’re going to drink it. Make sure it’s decaffeinated through a water process; otherwise, you’re drinking a bunch of chemicals used to get the caffeine out. Also, non-organic coffee was a runner-up on the “Dirty Dozen” list, which tracks the pesticide/herbicide/fungicide residues present on the 12 most contaminated produce items. Just something to think about.
I’d be interested to know if anyone else believes they’ve had success with this.