What if you had a graph of your blood sugar level, blood oxygen level, heart rate, and location minute by minute for the last month or so? Do you think that might help you figure out why you get tired every day at 4pm?
Bluetooth enabled wireless health monitoring systems are starting to come on the scene that could make this level of personal data collection possible. Tie the data together with a food diary and you might just have some fantastic diagnostic data. The GPS data would let you know if you were at the workout club.
As these devices shrink and become more powerful, a much richer picture of how our behavior affects our health may become clear to all of us.