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Hallberg's Picture of Health: The wearable device movement

Fitness trackers
Fitness trackers, from left, Basis Peak, Adidas Fit Smart, Fitbit Charge, Sony SmartBand, and Jawbone Move.
Bebeto Matthews / AP

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With Fitbits and other activity trackers becoming more popular, the pesky question of their effectiveness is being raised by researchers.

An article in the latest edition of the Journal of the American Medical Association questions how well they actually change health behaviors.

Tom Crann posed the same questions to the Fitbit-wearing Dr. Jon Hallberg.

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