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Doctors speaking to MIT Technology Review have told the magazine that patients who bring them copies of data generated by wearable fitness trackers are often a hinderance towards diagnosis and treatment . As Andrew Trister told MIT about his experiences with ' quantified self ' patients , " They come in with these very large Excel spreadsheets , with all this data — I have no idea what to do with that , " adding that it is difficult to interpret clinically meaningful trends from such a glut of non - contextual data . Almost all fitness trackers are marketed under the US FDA 's " wellness device " regulations , rather than the more rigorous medical device regulations , meaning that the data they collect is not really intended for clinical applications in the first place . Nonetheless , Trister believes that wearables do have an application : targeting specific symptoms , such as skin conductance to measure stress levels , over more general trackers .