Supporting Weight Management (SWiM): Evaluating the effectiveness, equity, and cost-effectiveness of using acceptance-based guided self-help to improve long-term outcomes of weight management interventions
Weight loss maintenance in adults with overweight or obesity who have recently completed one of a range of UK-commissioned standard behavioural programmes for the prevention and treatment of obesity and type 2 diabetes.
Participants will be randomly allocated to one of two groups (intervention or control) in a 1:1 allocation using block randomisation (block size 6) stratified by prior weight loss programme and weight loss medication use. Randomisation lists will be generated by the trial statistician using Stata statistical software and incorporated into the study database by the data manager. The randomisation lists will be unknown to all other personnel, including study coordinators, outcome assessors and investigators. Intervention SWiM (Supporting Weight Management) is a guided self-help programme that uses acceptance-based strategies to support weight maintenance following weight loss. It aims to help people This document is an unpublished preview, not for official use who have lost weight reflect on what has worked (and not worked) in the past, build on what works for them, and learn new strategies to overcome challenges that typically derail weight loss maintenance. The intervention includes access to an online web platform with 14 modules (SWiM sessions) consisting of psychoeducational content, reflective exercises, and behavioural experiment. Participants will also be provided with the option to receive an adapted paperbased workbook version of the module content. SWiM is intended to be a 4-month intervention, with weekly sessions for the first 3 months followed by a one-month break, and a final module at week 17. To guide them through the programme, participants receive 4 telephone support calls from a trained, non-specialist “SWiM coach” over the 4-month programme. Calls are scheduled for week 1 (activation call), week 3, week 8, and week 17. There will also be 3 optional calls that can be used at any time should the participant need additional coach support. Control No additional structured support will be offered, but participants will be free to use Local Authority- or NHS-commissioned services offered as standard care or self-fund their own methods. All partic
We will recruit UK adults (N=1,840) with obesity or overweight who have, in the previous 6 months, completed at least 60% of one of 5 weight loss programmes currently commissioned by the UK NHS or local authorities: 1. Tier 2 weight management programme 2. Tier 3 weight management 3. NHS Diabetes Prevention Programme 4. NHS Digital Weight Management Programme 5. NHS Diabetes Remission Programme Other inclusion criteria 1. Age ≥18 years 2. Capable of giving informed consent 3. Good understanding of the English language (the intervention and study materials are not tailored to support non-English language speakers) 4. Willing to be randomised 5. Willing to complete study measurements 6. Able to access the web-based platform from home
1. Current use of insulin 2. Previous or planned bariatric surgery 3. Current or planned pregnancy 4. Current diagnosis of eating disorder 5. A same household partner The Study Team reserves the right to withdraw a participant at any time if they don’t follow the protocol.