In this photo taken Wednesday, Dec. 16, 2009, after being fitted with a wireless sensor to gather vital signs and bluetooth cell phone for gathering data, fifteen-year-old Amorette Castillo, right, plays a video game while Eric Carles, 13, sits still at a University of Southern California lab in Alhambra, Calif. Scientists across the country are playing with miniature gadgets and fitting them on the overweight and obese to get an unbiased glimpse into their exercise and eating habits. (AP Photo/Kim Johnson Flodin)