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

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

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