The Impact of an Investment Based Intervention on Weight-loss and Beliefs About Food in Patients Post Bariatric Surgery

Study Overview
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Brief Summary
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Although obesity surgery is currently the most effective method for achieving weight loss, not all patients lose the desired amount of weight and some show weight regain. Previous pilot work by the lead researcher shows that successful weight loss is associated with the amount of investment the patient feels that they have made in their operation. For example, those who feel that it has taken more time and effort to organise, has cost more money, has been more disruptive to their family, social and work lives and has caused pain are more likely to lose weight after their operation. Therefore, it seems as if the greater the sense of investment, the greater the motivation to make the operation a success. The present study aims to build on these findings by encouraging weight loss surgery patients to focus on the investment they have made, thus making their investment more salient to them. Using a trial design, half the patients will be asked to rate and describe the investment they have made in their operation just before surgery (focusing on the time and effort to organise the surgery etc) and 3 months after surgery (focusing on time off work for recovery, disruption of family and friends, pain of surgery, pain of having the stitches removed etc). All patients will record their weight, beliefs about food, intentions to change their behaviour and actual eating and exercise behaviour at baseline then 3, 6 and 12 months follow up. The impact of the investment based intervention will then be assessed to explore whether focusing on the investment involved in having surgery improves patient health outcomes by one year.

Official Title
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The Impact of an Investment Based Intervention on Weight-loss and Beliefs About Food in Patients Post Bariatric Surgery.

Conditions
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Obesity

Intervention / Treatment
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* Behavioral: Investment intervention


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: aged 18 or over having bariatric surgery at University College Hospital Exclusion Criteria: if the patient does not understand English if the patient does not consent to take part in the study

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Supportive Care
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Investment intervention<br>Those in the investment group will complete carefully framed questions designed to raise the salience of the investment they have made in their procedure at baseline and 3 months follow up. The content of this intervention will be tailored to the recent experiences of the patient (ie pre or post surgery). | Behavioral: Investment intervention<br>* Those in the investment group will complete carefully framed questions designed to raise the salience of the investment they have made in their procedure at baseline and 3 months follow up. The content of this intervention will be tailored to the recent experiences of the patient (ie pre or post surgery).<br>|
| No Intervention: Control<br>Those in the control group will receive usual care. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in weight | Excess weight loss at 12 months after bariatric surgery. | 12 months follow up. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in psychological outcomes | Psychological issues relating to beliefs about food, intentions to change diet and exercise and actual diet and exercise behaviours. | 12 month follow up | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Bariatric Surgery, Health Psychology