Apple is known to be considering a Healthbook in iOS 8 that would keep track of the number of steps you took on a certain day, your heart rate, blood pressure, calories burned, and possibly your blood glucose. The readings would come from sensors employed on the iWatch that would capture measurements in real time.
Apple executives have allegedly been meeting with the FDA to discuss the Cupertino based firm's entry into the market for applications that monitor health related metrics. By offering potentially life-saving technology on its smartwatch, Apple could have a leg up on its rivals. The company has been hiring experts in such fields as sleep related disorders and those who are exercise physiologists. The latter "oversee the analysis, improvement, and maintenance of health and fitness; rehabilitation of heart disease and other chronic diseases and disabilities; and the professional guidance and counsel of athletes and others interested in sports training."
source: SFGate via RedmondPie