Reducing Snack Variety in Weight Loss Treatment

NCT ID: NCT00328744

Last Updated: 2012-04-20

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 202 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2006-07-31
• Study Completion Date: 2010-10-31

Brief Summary

The rising prevalence of obesity in the United States is believed to be due to increased exposure to adverse environmental factors, such as food portion sizes and increased dietary variety. Although decreasing portion sizes is a strategy used in weight loss programs, research has not studied the effects of decreasing dietary variety. Cross-sectional studies show a positive association between variety and body weight and in our own studies the investigators have shown that greater reductions in the number of different snack foods (i.e., cookies, chips) consumed predicted greater decreases in overall caloric and fat intake and greater weight loss. Limiting variety may reduce intake through long-term sensory-specific satiety and/or monotony. Reducing dietary variety is a novel dietary approach with the potential to improve long-term weight loss, which has not been studied as a clinical strategy in obesity research. The objective of this application is to conduct a randomized controlled trial of a behavioral weight loss intervention limiting the number of different snack foods consumed. Two hundred overweight and obese participants will be randomized to a standard behavioral intervention (Standard) or to a standard behavioral intervention that also limits the number of different snack foods consumed (Limited Variety). Both conditions will receive an 18-month standard behavioral intervention, using behavioral techniques (i.e., self-monitoring) to change eating behaviors. Participants in the Limited Variety condition will also limit variety in snack foods to only two chosen snack foods throughout the intervention. Measures of weight, snack food consumption and hedonics, and diet satisfaction will be taken at 0, 6, 12, and 18 months. This investigation will determine:

1. if the Limited Variety condition produces greater weight loss than the Standard condition at 18 months;

2. if the Limited Variety condition consumes fewer servings and calories from snack foods than the Standard condition;

3. if limiting snack food variety produces long-term sensory-specific satiety and/or monotony.

Relevance: Experimental studies show that limiting dietary variety profoundly reduces intake. To date, there is no dietary prescription that has been tested that capitalizes on the effect of variety on intake that can be maintained. This will be the first investigation to examine methods of manipulating dietary variety that can be adhered to over time and that influence intake, weight loss, and weight loss maintenance.

Conditions

Obesity

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

1

Behavioral: Behavioral weight loss (Standard)

Group Type: EXPERIMENTAL

Standard

Intervention Type: BEHAVIORAL

18-month standard behavioral weight loss intervention

2

Behavioral: Behavioral weight loss (Limited Variety)

Group Type: EXPERIMENTAL

Standard

Intervention Type: BEHAVIORAL

18-month standard behavioral weight loss intervention

Limited Variety

Intervention Type: BEHAVIORAL

Two chosen snack foods

Interventions

Standard

18-month standard behavioral weight loss intervention

Intervention Type: BEHAVIORAL

Limited Variety

Two chosen snack foods

Intervention Type: BEHAVIORAL

Eligibility Criteria

Inclusion Criteria

1. Age between 21 and 65 years. Older adults may have more medical co-morbidities, requiring greater medical supervision. Although pediatric obesity is a significant concern, this group has different nutritional needs and requires different levels of therapist and parental involvement than are proposed.

2. Body mass index (BMI) between 27 and 45 kg/m2. Based upon the Evidence Report (72), weight loss is recommended for individuals with a BMI > 25. A BMI of > 27 was chosen as eligibility criteria for this investigation because this level of BMI will allow for a 10% weight loss to occur prior to reaching a BMI of < 25. Individuals with a BMI of > 45 have more medical co-morbidities and require greater medical supervision, and thus will be considered ineligible for this investigation.

Exclusion Criteria

1. Report a heart condition, chest pain during periods of activity or rest, or loss of consciousness on the Physical Activity Readiness Questionnaire (PAR-Q) (73). Individuals endorsing joint problems, prescription medication usage, or other medical conditions that could limit exercise will be required to obtain written physician consent to participate.

2. Have an allergy to a food commonly found in snack foods (i.e., nuts, milk and egg proteins).

3. Report major psychiatric diseases or organic brain syndromes.

4. Are currently participating in a weight loss program and/or taking weight loss medication or lost > 5% of body weight during the past 6 months.

5. Intend to move outside of the metropolitan area within the time frame of the investigation.

6. Are pregnant, lactating, less than 6 months post-partum, or plan to become pregnant during the time frame of the investigation.

7. Consume < 5 different types of snack food per week. Pilot data indicated that upon screening 44 participants, mean weekly variety of snack foods was 8.7 (range 2 to 14, with only two participants consuming < 5 snack foods per week).

• Minimum Eligible Age: 21 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

National Institutes of Health (NIH)

NIH

Sponsor Role: collaborator

The Miriam Hospital

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Hollie Raynor, PhD

Role: PRINCIPAL_INVESTIGATOR

University of Tennessee

Locations

The Miriam Hospital

Providence, Rhode Island, United States

Countries

United States

References

Raynor HA, Van Walleghen EL, Bachman JL, Looney SM, Phelan S, Wing RR. Dietary energy density and successful weight loss maintenance. Eat Behav. 2011 Apr;12(2):119-25. doi: 10.1016/j.eatbeh.2011.01.008. Epub 2011 Jan 25.

Reference Type: DERIVED

PMID: 21385641 (View on PubMed)

Other Identifiers

R01DK074721-01

Identifier Type: NIH

Identifier Source: org_study_id

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