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This study enhanced understanding of mechanisms of action in group-based behaviour change interventions, identifying design features, facilitation techniques, change processes and contextual influences in groups targeting diet, exercise and weight loss.

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Aleksandra J Borek 1,2, Jane R Smith 1,*, Colin J Greaves 1,3, Fiona Gillison 4, Mark Tarrant 1, Sarah Morgan-Trimmer 1, Rose McCabe 1,5, Charles Abraham 1,6,*

1 Institute of Health Research, University of Exeter Medical School, University of Exeter, Exeter, UK
2 Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
3 School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
4 Department for Health, University of Bath, Bath, UK
5 School of Health Sciences, City, University of London, London, UK
6 School of Psychological Sciences, University of Melbourne, Melbourne, VIC, Australia
* Corresponding author Emails: and

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