Of course fitness trackers predominantly look at the exercise part of the weight loss equation, not the diet. The results seem to suggest that the streamlining of information makes people treat goals like excuses to celebrate, and it's posited that negative feelings when a goal isn't met can also deter dieters.

At the end of the day both groups did lose weight though, so if your fitness tracker is working for you, don't quit on our account.

[Via Stat]