Your Fitbit may be able to detect influenza-like diseases before you do, as discovered by a recent research published in The Lancet Digital Health journal.
By analysing one’s heart rate and sleep duration, wearables like Fitbit can identify abnormality in a user data through their weekly average heart rate and weekly average sleep. If the heart rate is above overall average and the amount of sleep is not below overall average, then the data is considered abnormal.
If we could really rely on wearables to detect diseases like influenza, then perhaps it could help the health practitioners prevent outbreaks at an earlier stage.