Winter Weight Watch Study: Efficacy of a brief public health intervention to prevent weight gain during the Christmas holiday period
| ISRCTN | ISRCTN15071781 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN15071781 |
| Secondary identifying numbers | 160673 |
- Submission date
- 10/08/2016
- Registration date
- 17/08/2016
- Last edited
- 12/12/2018
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Nutritional, Metabolic, Endocrine
Plain English summary of protocol
Background and study aims
Being obese (very overweight) can increase significantly the risk of serious diseases such as diabetes, heart disease, cancer and stroke. Studies show that many people gain weight over the Christmas period (average gain 0.5-1.0 kg per holiday) which is then not lost again once the holidays are over. This could mean that a person gains an extra 5-10kg over a ten year period. Whilst there is much publicity about holiday weight gain in the press, few studies address this problem. Many people gain weight over the holiday period because they typically eat a lot of high fat, high calorie food, snack a lot, are less physically active, drink more alcohol, eat more snacks, eat for longer periods and have easy access to food. People often feel holiday periods are a time where they can eat what they choose. There is a need therefore to investigate the effectiveness of simple, low-cost strategies to prevent people from gaining weight. The aims of this study are to assess whether a leaflet can prevent weight gain over the Christmas holiday period; to identify who is most likely to gain weight over Christmas; and to explore what causes people to gain weight.
Who can participate?
Healthy adults aged at least 18 with a BMI of 20.0 kg/m2 or more
What does the study involve?
Participants are randomly allocated to either the intervention (test) group or the usual care group. Those in the usual care group are given a standard information leaflet about healthy lifestyles. Those in the intervention group are given a leaflet that outlines key facts about gaining weight over Christmas and offers top tips to prevent it. This is not a study about dieting over Christmas, as this is unlikely to be acceptable to the public; rather, it is focused on raising awareness about the potential for holiday weight gain and suggests simple ways in which people can ensure a reasonable balance between calories consumed (eaten) and calories burned. The goal is for participants to gain no more than 0.5 kg. Participants are weighed before and after Christmas. Up to 20 participants from the intervention group are also interviewed about their experiences of the study to gain detailed feedback on the strategies used to maintain their weight over Christmas and any barriers they have experienced.
What are the possible benefits and risks of participating?
Potential benefits include prevention of weight gain during Christmas. There are no known risks.
Where is the study run from?
University of Birmingham (UK)
When is the study starting and how long is it expected to run for?
September 2016 to August 2019
Who is funding the study?
University of Birmingham (UK)
Who is the main contact?
Frances Mason
Contact information
Public
Dept. of Primary Care Clinical Sciences
College of Medical and Dental Sciences
University of Birmingham
Birmingham
B15 2TT
United Kingdom
Study information
| Study design | Randomised controlled trial and a qualitative study |
|---|---|
| Primary study design | Interventional |
| Secondary study design | Randomised controlled trial |
| Study setting(s) | Home |
| Study type | Prevention |
| Participant information sheet | Not available in web format, please use the contact details to request a participant information sheet. |
| Scientific title | Efficacy of a brief public health intervention to prevent weight gain during the Christmas holiday period: randomised controlled trial and nested qualitative study |
| Study acronym | WWW |
| Study objectives | The research has several aims: 1. To assess whether a brief low cost intervention can prevent weight gain over the Christmas holiday period 2. To identify who is most susceptible to weight gain over Christmas 3. Explore determinants of weight gain through a secondary analysis of the trial data 4. Understand participants’ experiences and thoughts about conscious energy restraint and energy expenditure at Christmas through semi structured interviews |
| Ethics approval(s) | University of Birmingham Science, Technology, Engineering and Mathematics Ethical Review Committee, 28/07/2016, ref: ERN_16_0673 |
| Health condition(s) or problem(s) studied | Obesity and overweight |
| Intervention | Participants will be recruited from community pharmacies, schools (parents) and supermarkets prior to Christmas. They will be randomised to either the intervention or the usual care group. 1. Intervention group: receive a leaflet that outlines key facts about Christmas holiday weight gain and offers top tips (‘Ten Top Tips’ leaflet) to prevent weight gain on holiday. The top ten tips leaflet has already been shown to be effective in community settings and needs minor amendments for use here. 2. Control group: receive an information leaflet about healthy lifestyles. This is not a study about dieting over Christmas, which would be very unlikely to be acceptable to the public; rather, it is focused on raising awareness about the potential for holiday weight gain and will suggest simple ways in which people can ensure reasonable energy balance, given many never lose the weight gained over Christmas. The behavioural goal will be for participants to gain no more than 0.5kg of their baseline weight. The primary outcome is change in weight. Participants will be weighed before and after Christmas (follow up). 284 participants will provide 80% power to detect 0.75kg (SD=2.0) difference in weight change between the groups. Up to 20 participants from the intervention group will be interviewed about their experiences of the study to gain detailed feedback on the behavioural/cognitive strategies used to maintain their weight over Christmas and any barriers they may experienced. |
| Intervention type | Behavioural |
| Primary outcome measure | Change in weight from baseline (mid-late November) to follow up (mid-January – early February) |
| Secondary outcome measures | 1. Proportion of participants in both groups who have gained ≤ 0.5 kg at follow up 2. Frequency of self-weighing in the previous two weeks using a single-item measure 3. Change in percentage body fat, measured by bioelectrical impedance at baseline and follow up Added 01/11/2018: 4. Difference between groups in cognitive restraint, emotional eating and uncontrolled eating as measured by the three factor eating questionnaire at baseline and follow up |
| Overall study start date | 26/09/2016 |
| Completion date | 01/08/2019 |
Eligibility
| Participant type(s) | All |
|---|---|
| Age group | Adult |
| Lower age limit | 18 Years |
| Sex | Both |
| Target number of participants | 284 |
| Key inclusion criteria | 1. Aged 18 years or more 2. BMI 20.0 kg/m2 or more |
| Key exclusion criteria | 1. Unable to understand English sufficiently to provide written informed consent 2. Women who are known to be pregnant or intending to become pregnant during the study period 3. Women who are breastfeeding |
| Date of first enrolment | 01/10/2016 |
| Date of final enrolment | 14/12/2018 |
Locations
Countries of recruitment
- England
- United Kingdom
Study participating centre
College of Medical and Dental Sciences
Birmingham
B15 2TT
United Kingdom
Sponsor information
University/education
Dept. of Primary Care Clinical Sciences
College of Medical and Dental Sciences
Birmingham
B15 2TT
England
United Kingdom
"ROR" |
https://ror.org/03angcq70 |
|---|
Funders
Funder type
University/education
No information available
Results and Publications
| Intention to publish date | 01/08/2020 |
|---|---|
| Individual participant data (IPD) Intention to share | Yes |
| IPD sharing plan summary | Available on request |
| Publication and dissemination plan | To be confirmed at a later date |
| IPD sharing plan |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Statistical Analysis Plan | 15/05/2018 | 15/05/2018 | No | No | |
| Results article | results | 10/12/2018 | Yes | No |
Additional files
- ISRCTN15071781_SAP_15May2018.docx
- Uploaded 15/05/2018
Editorial Notes
12/12/2018: Publication reference added.
01/11/2018: Secondary outcome measures updated.
15/05/2018: Uploaded statistical analysis plan.
