Introduction
obesity, overweight, weight loss
OBESITY, SECONDARY
Similar to other European countries, more than 50% of the adult population in Germany is overweight (body mass index (BMI) between 25.0 and 29.9 kg/mBesides traditional face-to-face settings, weight loss interventions delivered by smartphone applications (apps) are popular and increasingly used, but data on their effectiveness is still scarce and depends on the respective study design. A systematic review and meta-analysis by Villinger and colleagues [On 19th December 2019, the concept of Digital Health Applications (DiHA) was introduced in the German healthcare system with the Digital Healthcare Act [The aim of this study was to evaluate the efficacy and to examine the positive health care effect of a digital multimodal lifestyle intervention in people with obesity provided by a DiHA. The primary objective was to evaluate the effect of the app on weight loss after 12 weeks of application. The secondary objective was to evaluate the effect of the app on body weight after 12 weeks of follow-up, to assess quality of life after 12 and 24 weeks, and to examine the usability and acceptance of the app.