Wearable Activity Trackers Don't Improve Weight Loss Save

JAMA has reported the results of a 24-month trial showing that obese individuals on a long-term healthy diet and exercise program do not have significantly more weight loss from using a wearable device that tracks their activity. 

In a randomized clinical trial conducted at the University of Pittsburgh, 471 adult participants (with a BMI between 25-40) enrolled between 2010 and 2012. All subjects were placed on a low-calorie diet, prescribed increases in physical activity, and had group counseling sessions.

Patients randomized to the intervention group were given wearable device and accompanying web interface to monitor diet and physical activity - BodyMedia Fit Core, a wearable activity tracker worn on the upper arm. The Fit Core tracks steps, hours slept and calories burned and costs about $100.

After 24 months, people who used wearable activity trackers lost 2.4 kilograms (5.29 pounds) less than a group on a similar program but using a website to track their progress.

Both groups had improved their body composition, fitness, physical activity and diet, according to the report in JAMA.

The value and impact of wearable technology remains to be proven, especially with regard to weight loss.