An article, published in the Journal of the American Medical Association talks about the expanding market of wearable devices. However, the gap between recording information with them and projected or hoped-for changing behaviours is still wide and they propose and discuss a number of reasons for this.
The article is here:
Wearable Devices as Facilitators, Not Drivers, of Health Behavior Change
by Mitesh S. Patel, MD, MBA, MS; David A. Asch, MD, MBA; Kevin G. Volpp, MD, PhD