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A new report says fitness trackers are not so accurate in measuring the amount of calories our body while exercising, and that this may people to poor decisions about their diet. The study from Stanford University in the USA. Researchers the accuracy of five popular trackers. These the Apple Watch, Microsoft Band, Fitbit Surge and Samsung Gear S2. The researchers 60 volunteers as they walked, ran and while wearing the devices. Researchers found that none of the devices had an error rate below 20 per cent. Dr Euan Ashley, co-author of the study, : "People need to know that on energy expenditure, [the trackers] rough estimates."

The Stanford scientists users of fitness trackers should cautious about using the devices to what they eat. Dr Ashley said: "If you go to the gym, and you think you've 400 calories, then you might feel you've got 400 calories to with." This could be a problem for those who what they eat on how many calories their fitness tracker said they burned. One CEO of a fitness tracker company the researchers may not have adjusted the user settings properly. The CEO told the USA Today newspaper that the study method could have incorrect data, saying: "We the excess error reported in energy expenditure not representative in this study, due to this methodological error."

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