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Evaluation of a SlimFast Internet Behavioral Weight Loss Program

This study has been completed.
Information provided by:
The Miriam Hospital Identifier:
First received: September 14, 2005
Last updated: April 23, 2013
Last verified: September 2005
The Internet has been used effectively in behavioral weight loss programs. Most of these programs have involved a therapist who provides email counseling. The purpose of this study was to determine whether a computer-assisted weight loss program could be developed (that would use pre-programmed computer generated messages rather than human generated messages) and whether this program would be as effective as the therapist-assisted weight loss program.

Condition Intervention
Obesity Behavioral: Internet weight loss with SlimFast and human counseling Behavioral: Internet weight loss with SlimFast and computer counseling Behavioral: Internet weight loss program with SlimFast

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Factorial Assignment
Masking: Single
Primary Purpose: Treatment
Official Title: Development and Evaluation of a SlimFast Internet Behavioral Weight Loss Program

Resource links provided by NLM:

Further study details as provided by The Miriam Hospital:

Primary Outcome Measures:
  • Weight loss at 6 months

Secondary Outcome Measures:
  • Frequency of use of the Internet website

Estimated Enrollment: 225
Study Start Date: January 2001
Study Completion Date: January 2003
Primary Completion Date: January 2003 (Final data collection date for primary outcome measure)
Detailed Description:
Specific Aims Over 50% of Americans are overweight. These individuals are at increased risk of morbidity and mortality. Weight losses of 5-10% of body weight have been shown to lower these risks. The majority of individuals who lose weight do so on their own, without the help of formal programs. Developing ways to improve weight loss in such individuals is a major public health challenge. We believe that the Internet holds tremendous promise for reaching large numbers of overweight individuals and assisting them in their weight loss efforts. Our previous research has shown that a structured behavioral weight loss program offered via the Internet, with regular feedback from a therapist, can produce average weight losses of 9 lbs. at 6 months. The purpose of this project is to compare the weight losses achieved at 6 months using 3 different types of Internet programs, all of which are used in combination with SlimFast as the dietary component.Subject PopulationTwo hundred twenty-five overweight individuals will be recruited, aged 20-65 with a BMI of 27-40 who want to lose weight using SlimFast. Participants must be willing to attend an initial orientation and weigh-in session and follow-up weigh-in sessions and agree that they will not begin a second weight loss program within the next 12 months. Interested participants will be required to have access to a computer with Internet connection from their home or their workplace.Methods/DesignParticipants will be randomly assigned to one of three conditions: 1) SlimFast + Current SlimFast Website; 2) SlimFast + Current SlimFast Website + Computer-Generated E-mail feedback; or 3) SlimFast + Current SlimFast Website + Therapist-Assisted E-mail feedback. All 3 groups will be placed on a calorie-restricted diet (1200-1500 kcal/day) that utilizes SlimFast for 2 meals per day and a healthy evening meal. They will be encouraged to increase their exercise to 1000 kcal/week based on walking. Group 1 will receive all other input from the SlimFast website. Group 2 will receive weekly computer-generated feedback based on diet, physical activity and weight loss information. Group 3 will receive weekly e-mail messages from a trained therapist that will provide feedback based on diet, physical activity and weight loss information.Data AnalysisAll participants will be weighed at baseline, 3 months, and 6 months to document the weight changes they experience. The primary analysis will compare weight change from baseline to 6 months for the 3 conditions. An intent-to-treat analysis will be used, where dropouts are considered to have regained back to baseline weight. Secondary analyses will examine baseline predictors of weight loss and the association between use of the various Internet components and outcome.

Ages Eligible for Study:   20 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Overweight or obese

Exclusion Criteria:

  • heart disease
  • stroke
  • cancer
  • diabetes
  • orthopedic problems
  • pregnancy
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00200304

United States, Rhode Island
The Miriam Hospital
Providence, Rhode Island, United States, 02903
Sponsors and Collaborators
The Miriam Hospital
Principal Investigator: Rena R Wing, Ph.D. The Miriam Hospital
  More Information

Publications: Identifier: NCT00200304     History of Changes
Other Study ID Numbers: 2083-00
Study First Received: September 14, 2005
Last Updated: April 23, 2013

Keywords provided by The Miriam Hospital:
Weight loss

Additional relevant MeSH terms:
Weight Loss
Body Weight Changes
Body Weight
Signs and Symptoms processed this record on September 21, 2017