The WEIGH Study: Weighing to Improve and Gain Health (WEIGH)
The purpose of this research project is to assess the efficacy of a weight loss intervention for chronic disease prevention that focuses on daily self-weighing as the primary self-monitoring strategy compared to a delayed-intervention control group. While daily self-weighing has been shown to be effective for weight loss in observational research, there is limited experimental evidence testing this association and most is derived from intensive interventions that may overshadow the effects of self-weighing. To mitigate this, the investigators will examine whether daily self-weighing is effective for weight loss under self-directed conditions using a randomized-controlled design.
The investigators will conduct a 6-month randomized trial in 88 overweight and obese adults to compare a daily self-weighing intervention to a delayed-intervention control group. Changes in weight, diet and physical activity, and psychosocial measures will be examined.
Main Study Hypothesis: Participants in the group randomized to receive the daily self-weighing intervention will have greater percent weight loss at 6 months compared to those in the delayed control group.
Secondary Hypothesis: Participants in the group receiving the daily self-weighing intervention will report greater engagement in diet and physical activity behaviors that produce caloric deficits, greater self-efficacy and motivation, and no differences in body satisfaction, disordered eating, or depressive symptoms compared to those in the control group.
|Overweight and Obesity||Behavioral: Daily Self-weighing + weekly feedback+ weekly lessons|
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: No masking
Primary Purpose: Treatment
|Official Title:||The Use of Weight Tracking Technology to Promote Weight Loss Among Overweight Adults|
- Percent Weight Loss [ Time Frame: 6 months ]The primary outcome is percent weight loss at 6 months. Weight will be collected at baseline, 3, and 6 months at the UNC Weight Research Program Center and measured to the nearest 0.2 lbs using a digital Tanita scale that will be calibrated routinely. Participants will weigh-in wearing light clothes and no shoes
- Changes in Caloric Intake [ Time Frame: 6 months ]Caloric intake will be assessed at baseline, 3 and 6 months using the online Automated Self-Administered 24-hour recall tool created by the National Cancer Institute.
- Changes in Energy Expenditure from Exercise [ Time Frame: 6 months ]Energy expenditure from exercise will be assessed at baseline, 3, and 6 months via the Paffenbarger Exercise Habits Questionnaire.
- Changes in Self-efficacy for Eating Behaviors [ Time Frame: 6 months ]We will assess self-efficacy for eating behaviors related to weight control at baseline, 3 and 6 months using the Weight Efficacy Lifestyle Questionnaire.
- Changes in self-efficacy for exercise behaviors [ Time Frame: 6 months ]We will assess self-efficacy for exercise behaviors at baseline, 3 months, and 6 months using the Sallis Self-efficacy for Exercise Behaviors Questionnaire.
- Changes in Weight Control Strategies (diet and exercise) [ Time Frame: 6 months ]At baseline, 3months, and 6 months, we will assess behavioral strategies (both diet and exercise) associated with successful weight control using the Eating Behavior Inventory and the Weight Management Strategies Questionnaire. These strategies have been shown to be associated with greater weight loss in other weight control trials.
- Changes in Motivation [ Time Frame: 6 months ]We will assess autonomous and controlled motivation at baseline, 3 months, and 6 months using the Treatment Self-Regulation Questionnaire.
- Changes in Dietary Hunger, Restraint, and Disinhibition [ Time Frame: 6 months ]We will assess dietary hunger, restraint, and disinhibition at baseline, 3 months, and 6 months using the Three Factor Eating Questionnaire.
- Changes in Binge Eating symptoms [ Time Frame: 6 months ]The Questionnaire on Eating and Weight Patterns-Revised will be administered at baseline, 3 months, and 6 months to assess changes in behaviors related to binge eating and bulimia.
- Changes in depressive symptoms [ Time Frame: 6 months ]The Center for Epidemiologic Studies Depression Scale will be used to assess depressive symptoms at baseline, 3 months, and 6 months.
- Changes in Body Shape Concerns [ Time Frame: 6 months ]The Body Shape Questionnaire will be used to assess changes in body shape concerns at baseline, 3 months, and 6 months.
- Changes in cognitions related to disordered eating [ Time Frame: 6 months ]Disordered eating cognitions, patterns, and behaviors will be assessed using a brief version of the Mizes Anorectic Cognitions Questionnaire (BMAC-Q) at baseline, 3 months, and 6 months.
|Study Start Date:||February 2011|
|Study Completion Date:||November 2011|
|Primary Completion Date:||August 2011 (Final data collection date for primary outcome measure)|
Experimental: Daily self-weighing + feedback/lessons
Participants will be instructed to weigh daily and they will receive a smart scale for daily monitoring of weighing via the website bodytrace.com. They will also receive weekly emailed lessons with content related to behavioral weight control (e.g., How to control portion sizes, How to develop an exercise routine) as well as weekly emailed feedback from a registered dietitian on their daily weighing and weight loss progress.
Behavioral: Daily Self-weighing + weekly feedback+ weekly lessons
Daily self-weighing as a form of self-monitoring of body weight using a smart scale that sends their weights directly to a website (www.bodytrace.com) via the cellular network. They will be able to review weight trends overtime on this website via a graph showing both changes in weight and BMI. They will also receive weekly emailed feedback on their weight loss progress and compliance to the daily self-weighing prescription from a registered dietitian, as well as weekly emailed lessons with content related to behavioral weight control (e.g, how to control portion sizes, how to develop and exercise routine).
Other Name: Daily Self-weighing Intervention
No Intervention: Delayed Intervention Control Group
Participants will receive the same components of the experimental group with the exception of the weekly feedback after the 6-month study period is complete.
Show Detailed Description
Please refer to this study by its ClinicalTrials.gov identifier: NCT01369004
|United States, North Carolina|
|UNC Weight Research Program|
|Chapel Hill, North Carolina, United States, 27510|
|Principal Investigator:||Dori M Steinberg, PhD, MS, RD||University of North Carolina, Chapel Hill|
|Study Director:||Deborah Tate, PhD||University of North Carolina, Chapel Hill|