A1 Journal article (refereed)
Theory-based digital intervention to promote weight loss and weight loss maintenance (Choosing Health) : protocol for a randomised controlled trial (2020)

Kwasnicka, D., Luszczynska, A., Hagger, M. S., Quested, E., Pagoto, S. L., Verboon, P., Robinson, S., Januszewicz, A., Idziak, P., Palacz, I., & Naughton, F. (2020). Theory-based digital intervention to promote weight loss and weight loss maintenance (Choosing Health) : protocol for a randomised controlled trial. BMJ Open, 10(11), Article e040183. https://doi.org/10.1136/bmjopen-2020-040183

JYU authors or editors

Publication details

All authors or editors: Kwasnicka, Dominika; Luszczynska, Aleksandra; Hagger, Martin S.; Quested, Eleanor; Pagoto, Sherry L.; Verboon, Peter; Robinson, Suzanne; Januszewicz, Anna; Idziak, Paulina; Palacz, Iga; et al.

Journal or series: BMJ Open

eISSN: 2044-6055

Publication year: 2020

Volume: 10

Issue number: 11

Article number: e040183

Publisher: BMJ Publishing

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1136/bmjopen-2020-040183

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/73029

Publication is parallel published: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7684829/

Additional information: Protocol.


Introduction: Digital behavioural weight loss interventions have the potential to improve public health; however, these interventions are often not adequately tailored to the needs of the participants. This is the protocol for a trial that aims to determine the effectiveness and cost-effectiveness of the Choosing Health programme as a means to promote weight loss and weight loss maintenance among overweight/obese adults.

Methods and analysis: The proposed study is a two-group randomised controlled trial with a nested interrupted time series (ITS) within-person design. Participants (n=285) will be randomly assigned to either the Choosing Health digital intervention or a control group. For intervention participants, ecological momentary assessment will be used to identify behavioural determinants for each individual in order to tailor evidence-based behaviour change techniques and intervention content.

Control group participants will receive non-tailored weight loss advice via e-book and generic emails. The primary outcome is the mean difference in weight loss between groups at 6 months controlled for baseline. Secondary outcomes include blood pressure and percentage of body fat; self-reported measures of physical activity, sitting time, quality of life, cost and theory-derived correlates of weight loss. Secondary outcomes will be measured at baseline, 3, 6 and 12 months. The primary outcome for ITS will be daily weight loss plan adherence. Data will be analysed using regression and time series analyses.

Ethics and dissemination: Ethics approval was granted by Faculty of Psychology, SWPS University of Social Sciences and Humanities, Wroclaw, Poland, approval number 03/P/12/2019. The project results will be disseminated through structured strategy implemented in collaboration with the Ministry of Health.

Keywords: health behaviour; weight control; weight loss; e-healthcare; intervention study

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1

Last updated on 2021-09-08 at 18:09