It is tempting to believe the cute little mobile app when it tells me me I’ve burned 570 calories in the last hour when I know the only thing I’ve done for the last 60 minutes is laugh on the phone with my sister while eating a snow cone.
Fitness trackers are fabulous though some are not entirely accurate. Keep this in mind if you use one. Several studies (this article goes into detail about one: https://www.livescience.com/59242-how-accurate-is-your-fitness-tracker-really.html) have demonstrated just how inaccurate data from fitness trackers can be (like calories burned). Until these mainstream devices are consistently providing valid data, avoid making decisions regarding your health and/or diet based solely on the data received from these devices. Privacy may also be a concern in regards to the data collected on users of fitness trackers. Data regarding vitals, location and level of activity is valuable and could be used in a variety of ways that you may or may not approve of (e.g. investigations, estimating lifespan, and determining eligibility for programs).