Obesity, Overweight
Conditions
Keywords
Group-delivered Diabetes Prevention Program, Obesity, Overweight, Lifestyle change, Healthy eating, Weight loss, Exercise, Cognitive-behavioral intervention, Implementation intentions, Mental imagery, Mental practice, If-then plans
Brief summary
The Diabetes Prevention Program (DPP) is highly effective in promoting weight loss in overweight and obese individuals (e.g., 7% average loss of body weight), and thereby reducing the risk of developing weight-related health consequences. One-on-one DPP sessions, however, are costly and the group-delivered DPP version, the Group Lifestyle Balance program (GLB), is less effective (4% average loss of body weight). The aim of this two-arm parallel randomized controlled trial is to increase the effectiveness of the GLB by integrating habit formation techniques, namely if-then plans and their mental practice, into the program. The study will provide evidence-based data on the effectiveness of an enhanced GLB intervention in promoting weight loss and in reducing weight-related risk factors for chronic health problems.
Detailed description
Please see brief summary.
Interventions
BEHAVIORALEnriched GLB
Habit formation techniques, namely if-then plans and their mental practice are being added to the standard Group Lifestyle Balance program.
BEHAVIORALStandard GLB
This arm is the standard Group Lifestyle Balance program
Sponsors
McGill University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
* men and women * ages of 18 and 75 * overweight or obese (BMI 28-45 kg/m2) * sedentary (\< 200 min/week of moderate or vigorous exercise) * waist circumference of \>= 88cm for women and \>= 102cm for men
Exclusion criteria
* diabetes (hemoglobin A1c \< 7.0%). * taking the medication metformin (used for treating pre-diabetes or diabetes) * having been pregnant in the past 6 months or planning on becoming pregnant in the next 2 years * currently undergoing treatment for cancer * using medication that affects body weight (e.g., loop diuretics) * being unable to participate in regular moderate physical activity * having severe uncontrolled hypertension (\> 190/100mm Hg) * being unable to communicate in English or French * being diagnosed with bulimia nervosa, currently active major depression, or other severe psychiatric disease (including dementia); * suffering from a heart attack, stroke, or heart failure within the past 6 months * experiencing excessive weight loss (more than 10 pounds or 4.54 kilograms) in the past 3 months * currently participating in another weight loss program * having had bariatric surgery in the past 2 years or plans on getting it in the near future * planning on moving away from Montreal within the next year * having another member of one's household enrolled in the program.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Percent body weight loss | 3 months after beginning of the intervention | The primary outcome will be percent body weight loss from baseline to 3 months after the beginning of the intervention. Weight in kg. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Waist circumference | 3 months | Risk factor for chronic health problems. |
| Total cholesterol/HDL ratio | 3 months | Risk factor for chronic health problems. |
| Physical activity duration | 3 months | Total minutes per week. |
| Number of steps taken per week | 3 months | Steps taken per week, recorded using a pedometer. |
| Exercise stress test (EST) | 3 months | — |
| Percent body weight loss | 12 months | Percent body weight loss 12 months after the beginning of the intervention. Weight in kg. |
| Personal weight loss goal | 3 months | Reaching percent body weight loss goal (7% of body weight) from baseline to 3 months after the beginning of the intervention. Weight in kg. |
| Personal exercise goal | 3 months | Reaching exercise goal (150 min/week) from baseline to 3 months after the beginning of the intervention. Sum of minutes over 7 days. |
| Hemoglobin A1c levels | 3 months | Risk factor for chronic health problems. |
| Blood pressure | 3 months | Risk factor for chronic health problems. |
Other
| Measure | Time frame | Description |
|---|---|---|
| Habit formation indices of physical activity tracking | 3 months | Frequency of physical activity tracking. |
| Habit formation indices of fat grams and calorie tracking | 3 months | Frequency of food tracking. |
| Habit formation indices of weight tracking | 3 months | Frequency of weight tracking. |
| Self-Report Index of Habit Strength | 3 months | Self-monitoring and behaviors |
Countries
Canada
Outcome results
None listed