I'm not much of a health or fitness nut. To be honest, I tend to be rather pedestrian about affairs of health, only really listening when my wife (quite correctly) points out I shouldn't have that next slice of pizza, or to avoid that dread macaroni & cheese (yum!). Combined with both a genetic and extrinsic love of all things sweet and dessert-like, and very low levels of self control when confronted with the possibility of Italian kisses (for those non SA-based, small balls of ice cream generally covered either in chocolate, caramel or both), a fatalistic combination indeed. What you can't measure, you can't control.
Enter the Jawbone Up. In a word, I now have visibility in my movement during the day, how I'm sleeping, and a series of reminders and hints that effectively force me to think about my food intake (note, I said think, not necessarily dictate), and to provide some data and insight. I can highly recommend it!