Developers can, however, hand the data over to medical researchers with a user's consent.
When Apple unveiled its HealthKit toolset for app developers at the Worldwide Developer Conference in June, it hinted at a future where everything from our heart rates to our daily footsteps to our sleep time could be tallied and molded into raw data, thanks to iOS 8 and a possible watch. The platform would allow developers like Nike and Jawbone to build new and exciting health-tracking apps, which could be compiled into iOS 8's Health app.