Energy Balancing Modeling and Mobile Technology to Support e-Weight Loss

Study Overview
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Brief Summary
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Behavioral lifestyle treatment for obesity produces clinically significant weight loss and corresponding improvements in disease risk and severity when delivered via in-person group and/or individual treatment sessions. Online versions have been developed in order to reduce costs. These programs typically include weekly weight loss lessons and tailored feedback on patients' weight loss progress. However, online programs often produce suboptimal outcomes compared to programs delivered in-person due to insufficient adherence to prescribed behavioral strategies, and a lack of objective methods for behavioral self-monitoring to support adherence. One approach to monitoring and improving adherence involves tracking patients' weight loss progress on a personalized nomogram (i.e., graph). The nomogram is based on a dynamic energy balance equation and depicts the expected weight loss over time if the participant is adherent to a prescribed goal for caloric intake and physical activity. A complementary approach to measuring and intervening on adherence involves the use of mobile technology to monitor eating behavior. The Bite Counter is a wrist-worn device similar to a wristwatch that measures the timing, frequency, rate, and duration of eating events by monitoring the wrist roll motion that occurs when food is brought to the mouth. By using mathematical models to calibrate the Bite Counter to the weight loss nomogram, it may be possible to identify the optimal number of bites that any given patient should take each day in order to facilitate weight loss. The purpose of the proposed study is to conduct a small randomized controlled trial to test the feasibility, acceptability, and preliminary efficacy of adding weight loss nomograms and the Bite Counter to an established online weight loss program. A sample of 30 participants with overweight/obesity will be randomly assigned in equal proportions to one of three 12-week weight loss programs: (a) online behavioral weight loss treatment alone (OBWL), (b) online behavioral weight loss treatment plus the provision of weight loss nomograms with weekly feedback tailored to the nomogram (OBWL+N), or (c) online behavioral weight loss treatment plus the provision of weight loss nomograms with weekly feedback tailored to the nomogram and provision of a Bite Counter that can be used to alert participants when they are approaching their maximum number of prescribed bites per day (OBWL+N&BC).

Conditions
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Overweight, Obesity

Intervention / Treatment
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* Behavioral: Online Behavioral Weight Loss program
* Behavioral: Weight Loss Nomogram
* Behavioral: Bite Counter


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Body mass index (BMI) between 27 and 45 kg/m^2 Exclusion Criteria: Self-report of health problems that make weight loss or unsupervised exercise unsafe or unreasonable A heart condition, chest pain during periods of activity or rest, or loss of consciousness on the Physical Activity Readiness Questionnaire Currently pregnant or intend to become pregnant in the next 6 months Planning to move outside of the geographic region within the next 6 months Self-report any cognitive or physical limitations that preclude use of a personal computer Participation in a study conducted at the research center in the past 2 years Use of a commercial weight loss program within the last 6 months Self-report a history of clinically diagnosed eating disorder excluding Binge Eating Disorder Previous surgical procedure for weight loss Current use of weight loss medication Treatment of cancer within the last 6 months

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

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
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Online Weight Loss Program<br> | Behavioral: Online Behavioral Weight Loss program<br> <br> |
| Experimental: Online Weight Loss Program + Nomogram<br> | Behavioral: Online Behavioral Weight Loss program<br> <br> Behavioral: Weight Loss Nomogram<br> <br> |
| Experimental: Online Weight Loss Program + Nomogram + Bite Counter<br> | Behavioral: Online Behavioral Weight Loss program<br> <br> Behavioral: Weight Loss Nomogram<br> <br> Behavioral: Bite Counter<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Weight Loss |  | 6 months after beginning treatment | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of online weight loss lessons viewed |  | 6 months after beginning treatment | 
| Number of weeks body weight, caloric intake, and physical activity reported online |  | 6 months after beginning treatment | 
| Number of weekly clinic visits attended |  | 6 months after beginning treatment | 
| Average number of bites of food per day |  | 6 months after beginning treatment |