Jayjay, +1 on the caffeine. I let go of coffee a few years back, and I'm calmer and happier and much more patient (with myself and with others).

In my case, I also lost alot of weight when I stopped drinking coffee because I stopped going to Starbucks and stopped having those high-calorie (empty calories) coffee drinks and muffin-cakes. I wonder also if eliminating caffeine also changed my metabolism somehow. I stopped the coffee and the weight just came off without a whole lot of extra effort. I did start eating more fruit, and I was riding my bike alot already. I don't know about the metabolism thing, though. Just a guess.