The WORLD (Weight Optimization: Revamping Lifestyles Using the Dietary Guidelines) Study - Developing, Implementing, and Testing an Education Program
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The WORLD study is a single-center, year-long randomized controlled trial in free-living women. Participants were randomly assigned to follow either a lower-fat (LF) diet or a moderate-fat (MF) diet for weight management in a parallel-arm design. The two phases of the study were a weight-loss phase (phase 1) and a weight-maintenance phase (phase 2) (Figure 1). During phase 1, months 1 through 4, participants consumed a hypo-caloric diet consistent with the 2005 Dietary Guidelines in the free-living environment. During phase 2, months 5 through 12, participants shifted into weight maintenance. It was hypothesized that a weight-loss intervention at the extremes of dietary fat recommendations of the 2005 Dietary Guidelines would be equally effective for weight loss while achieving comparable nutrient adequacy. Also, Overall, the lower-fat and moderate-fat diets would both be nutritionally adequate, based on the Healthy Eating Index.
Condition | Intervention |
---|---|
Obesity Cardiovascular Disease |
Behavioral: Moderate-fat Behavioral: Lower-fat |
Study Type: | Interventional |
Study Design: | Allocation: Randomized Endpoint Classification: Efficacy Study Intervention Model: Parallel Assignment Masking: Open Label Primary Purpose: Prevention |
Official Title: | Development, Implementation, & Testing and Education Program to Teach Weight Loss Using the 2005 Dietary Guidelines to Pre-Menopausal Women |
- Body weight [ Time Frame: Baseline, month 4, month 8, month 12 ] [ Designated as safety issue: No ]
- Lipid Profile [ Time Frame: Baseline, month 4, month 8, month 12 ] [ Designated as safety issue: No ]
- Glucose [ Time Frame: Baseline, month 4, month 8, month 12 ] [ Designated as safety issue: No ]
- Insulin [ Time Frame: Baseline, month 4, month 8, month 12 ] [ Designated as safety issue: No ]
- C-reactive protein [ Time Frame: Baseline, month 4, month 8, month 12 ] [ Designated as safety issue: No ]
- Dietary intake [ Time Frame: Baseline, month 4, month 12 ] [ Designated as safety issue: No ]
- Body composition [ Time Frame: Baseline, month 4, month 12 ] [ Designated as safety issue: No ]
- Fitness via VO2max [ Time Frame: Baseline, month 4, month 12 ] [ Designated as safety issue: No ]
- Cognitive-behavioral measures [ Time Frame: Baseline, month 4, month 8, month 12 ] [ Designated as safety issue: No ]
Enrollment: | 101 |
Study Start Date: | March 2006 |
Study Completion Date: | December 2010 |
Primary Completion Date: | June 2008 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
---|---|
Experimental: Moderate-fat
35% of calories from fat
|
Behavioral: Moderate-fat
35% of calories from fat
|
Experimental: Lower-fat
20% of calories from fat
|
Behavioral: Lower-fat
20% of calories from fat
|
Ages Eligible for Study: | 21 Years to 50 Years |
Genders Eligible for Study: | Female |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
- 21-50 years
- BMI: 25-39.9 kg/m2
- LDL-C: 100-189.9 mg/dL
Exclusion Criteria:
- Triglycerides > 350 mg/dL
- History of myocardial infarction, stroke, diabetes mellitus, liver disease, kidney disease, and thyroid disease
- High alcohol consumption (<14 drinks/week)
- Use of medication or supplements for lowering blood lipid levels (i.e., statin, fibrates, psyllium, fish oil capsules, soy lecithin, phytoestrogens)
- Lactating, pregnant, or wanting to become pregnant during the study
- Weight loss or gain ≥ 10% body weight in the previous 6 months
- Eating Attitudes Test-26 score > 20
- Beck Depression Inventory-II score ≥ 29
- Gormally Cognitive Factors Related to Binge Eating Scale score > 30
- Physical Activity Readiness Questionnaire score > 2
United States, Pennsylvania | |
Penn State University | |
University Park, Pennsylvania, United States, 16802 |
Principal Investigator: | Penny M Kris-Etherton, PhD, RD | Penn State University |
Additional Information:
No publications provided
Responsible Party: | Penny Kris-Etherton, Distinguished Professor of Nutrition, Penn State University |
ClinicalTrials.gov Identifier: | NCT00847574 History of Changes |
Other Study ID Numbers: | WORLD Study, USDA CSREES #2005-55215-04811 |
Study First Received: | February 18, 2009 |
Last Updated: | November 30, 2011 |
Health Authority: | United States: Institutional Review Board |
Keywords provided by Penn State University:
Weight loss Weight maintenance Weight management Cardiovascular disease risk |
Dietary Guidelines Diet and exercise Prevention |
Additional relevant MeSH terms:
Cardiovascular Diseases Obesity Overnutrition Nutrition Disorders |
Overweight Body Weight Signs and Symptoms |
ClinicalTrials.gov processed this record on September 26, 2012