Wearables are collecting a flood of data. An ambitious new study of pregnancy aims to prove that’s valuable for health
When Stephen Friend left Apple in 2017 after a stint helping to jumpstart its health efforts, the company’s marketing engine was already promoting a future that hadn’t arrived: Apple devices were going to help you live a healthier life.
In reality, iPhones, Apple Watches, and competitor products were collecting a flurry of data about activity, heart rate, and sleep. But the evidence they could detect disease or actually improve health outcomes was nascent.
