"Von smarten Uhren und digitalen Spuren. Potenziale und Risiken digitaler gesundheitsbezogener Daten [On Smart Watches and Digital Traces. Potentials and Risks of Digital Health-Related Data]", invited talk by M. Grimm in the context of the lecture series "Gesunde neue Welt [Healthy New World]" of the Forum Offene Wissenschaft on 25 January 2016 at the University of Bielefeld, Germany.