An ACT-Based Physician-Delivered Weight Loss Intervention

Study Overview
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Brief Summary
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The purpose of the present study was to conduct a pilot RCT to test the feasibility of a physician-delivered ACT-based intervention for emotional eaters with overweight/obesity against standard care at a network of weight loss clinics. Participants were randomized to receive either standard care at the clinics or the ACT intervention.

Detailed Description
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The purpose of the present study was to conduct a pilot RCT to test the feasibility of a physician-delivered ACT-based intervention for emotional eaters with overweight/obesity against standard care at a network of weight loss clinics. Psychology clinical PhD students trained physicians in the delivery of the brief manualized intervention and were available for regular consults. The intervention consisted of eight, 5-10 minute sessions that could be easily incorporated into the physician's current practice. Over the duration of the ACT intervention, physicians met individually with patients to teach them various techniques to address and improve mindfulness, acceptance, and values clarification and commitment, all of which emotional eaters have been found to struggle with (Forman & Butryn, 2014). The proven habit formation technique of if-then planning (Gollwitzer, 1993) was used throughout these sessions in order to train emotional eaters to habitually use ACT techniques and to change the maladaptive habit of eating in response to negative emotions.

Official Title
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An ACT-Based Physician-Delivered Weight Loss Intervention

Conditions
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Overweight and Obesity, Eating Behavior

Intervention / Treatment
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* Behavioral: ACT Intervention
* Behavioral: Standard Care


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Only participants considered to be emotional eaters, as assessed by a score of 3.25 or higher on the Dutch Eating Behavior Questionnaire (DEBQ), were recruited for the study (van Strien, Herman, Anschutz, Engels, & de Weerth, 2012). Exclusion Criteria: Not being an emotional eater. Participants who did not speak, write, and read in English fluently were excluded from the study, as well as those who were pregnant.

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: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: The present study was a two-arm pilot randomized controlled trial.
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Standard Care<br>Participants in the standard care condition were provided with diet and exercise counselling and psychoeducation from their physicians over the course of 8 sessions, as was routinely done at the clinic. Standard care did not involve any targeted intervention to reduce emotional eating. | Behavioral: Standard Care<br> <br> |
| Experimental: ACT Intervention<br>In addition to receiving standard care, participants in the ACT condition were taught techniques to reduce their emotional eating. Three overarching skills were taught over the course of the ACT intervention: (1) values clarification and commitment, (2) metacognitive awareness, and (3) distress tolerance. Throughout the sessions, physicians formed if-then plans with the patients to specify how to habitually use the ACT techniques to reduce emotional eating in their everyday lives. At the end of each session, participants were given a one-page homework sheet that asked them to monitor their behavior and their use of the ACT techniques during the week. | Behavioral: ACT Intervention<br> <br> Behavioral: Standard Care<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Weight Change | Weight change in kilograms | Baseline to Post-Intervention (on average, 16 weeks) | 
| Emotional Eating Change | Assessed by the Dutch Eating Behavior Questionnaire (DEBQ) emotional eating subscale. Scores range from 1 (never) to 5 (very often). Lower scores reflect lower emotional eating. This subscale score is calculated by taking the mean of all items on the subscale. Negative change scores reflect decreases in emotional eating. | Baseline to Post-Intervention (on average, 16 weeks) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Body Fat Percentage Change | Change in body fat percentage | Baseline to Post-Intervention (on average, 16 weeks) | 
| External Eating Change | Assessed by the Dutch Eating Behavior Questionnaire (DEBQ) external eating subscale. Scores range from 1 (never) to 5 (very often). Lower scores reflect lower external eating. This subscale score is calculated by taking the mean of all items on the subscale. Negative change scores reflect decreases in external eating. | Baseline to Post-Intervention (on average, 16 weeks) | 
| Restraint Eating Change | Assessed by the Dutch Eating Behavior Questionnaire (DEBQ) restraint eating subscale. Scores range from 1 (never) to 5 (very often). Lower scores reflect lower restraint eating. This subscale score is calculated by taking the mean of all items on the subscale. Positive change scores reflect increase in restraint eating. | Baseline to Post-Intervention (on average, 16 weeks) | 
| Distress Tolerance Change | Assessed by the Distress Tolerance Scale (DTS). All items were rated on a 5-point Likert scale from 1 (strongly agree) to 5 (strongly disagree). The score is calculated as the mean of all items. Higher scores reflect higher levels of distress tolerance. Positive change scores reflect increases in distress tolerance. | Baseline to Post-Intervention (on average, 16 weeks) | 
| Mindfulness Awareness Change | Assessed by the Philadelphia Mindfulness Scale (PHLMS). All items were rated on a 5-point Likert scale from 1 (never) to 5 (very often). The subscale score is calculated as the sum of all items on the subscale, with the minimum possible score being 10 and the maximum possible score being 50. Higher scores reflect higher levels of awareness. Negative change scores reflect decreases in mindfulness and positive change scores reflect increases in mindfulness. | Baseline to Post-Intervention (on average, 16 weeks) | 
| Values Clarification/ACT Application Change | This questionnaire was developed for the present study to evaluate participants' real world application of the intervention. Participants were asked to indicate their level of agreement on a 5-point scale (1 = strongly agree and 5 = strongly disagree) to prompts such as My values motivate me to lose weight and I am able to accept negative emotions and don't have to eat when I'm feeling bad. Total score was calculated as the mean of all items. Lower scores indicate higher values clarification. Negative change scores reflect increases in ACT application and values clarification. | Baseline to Post-Intervention (on average, 16 weeks) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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emotional eating