eButton Combines the Powers of Cameras, GPS, and Other Sensors to Combat
  Obesity 
From: Evaluation Engineering News - 11/23/2011

People attempting to lose weight won’t need to track their daily food intake
anymore, thanks to a wearable, picture-taking device created at the
University of Pittsburgh. eButton—a device worn on the chest (like a pin)
that contains a miniature camera, accelerometer, GPS, and other
sensors—captures data and information of health activities. The eButton
prototype was the result of research from a four-year NIH Genes, Environment,
and Health Initiative grant that ended this year. 

"eButton was created to combat obesity, which has become a widespread problem
in the United States," said Mingui Sun, lead investigator and Pitt professor
of neurosurgery and electrical and computer engineering. "This disease
affects 60% of people and costs our country upwards of $225 billion in direct
and indirect costs."  

Read the entire article at:
http://www.news.pitt.edu/news/pitt-researchers-develop-ebutton-easier-way-monitor-food-intake-exercise-and-lifestyl

Links:
Mingui Sun
http://www.neurosurgery.pitt.edu/faculty/sun.html

eButton knows if you're a workout warrior or a slug
http://news.cnet.com/8301-17938_105-57321725-1/ebutton-knows-if-youre-a-workout-warrior-or-a-slug/