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

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