Noncommunicable diseases (NCDs) account for 70% of all deaths in a year globally. The 4 main NCDs (cardiovascular diseases, cancers, chronic pulmonary diseases, and diabetes mellitus) all share the same behavioral risk factors: physical inactivity, an unhealthy diet, tobacco use, and harmful use of alcohol.

Fifty percent of persons with NCDs do not adhere to the prescribed treatment; in fact, adherence to lifestyle interventions in particular is considered a major challenge. Feedback seems to be essential for success in behavioral change. Smartphone apps permit structured monitoring of health parameters, as well as the opportunity to receive feedback.