Fitness trackers largely inaccurate when counting calories, Stanford researchers say

Fitness trackers, from left, Basis Peak, Adidas Fit Smart, Fitbit Charge, Sony SmartBand and Jawbone Move. Research found that about a third of trackers are abandoned after six months.<!–IPTC: FILE - In this Dec. 15, 2014 file photo, fitness trackers, from left, Basis Peak, Adidas Fit Smart, Fitbit Charge, Sony SmartBand, and Jawbone Move, are posed for a photo next to an iPhone, in New York. Sales of fitness trackers are climbing, and the biggest maker of the gadgets, Fitbit, made a splashy debut on the stock market Thursday, June 18, 2015. (AP Photo/Bebeto Matthews, File)–>
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