Study design
The NoHoW trial is a three-centre (University of Leeds (UK), The Parker Institute (Denmark) and University of Lisbon (Portugal)) 2 × 2 factorial, randomized, single-blind, controlled trial testing the proof-of-concept of a digital toolkit for weight regain prevention in over 1600 participants (European Union’s Horizon 2020 research and innovation program under grant agreement No. 643309).The intervention was developed according to the Medical Research Council Framework for developing and evaluating RCTs for Complex Interventions to Improve Health [For this ancillary NoHoW study, baseline, 6-month, and 12-month data from the four experimental arms were pooled into one single group, as such, the present study is observational and longitudinal in nature.