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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT02898844
Other study ID # 13-000666
Secondary ID
Status Completed
Phase N/A
First received September 8, 2016
Last updated September 12, 2016
Start date October 2013
Est. completion date December 2014

Study information

Verified date September 2016
Source University of California, Los Angeles
Contact n/a
Is FDA regulated No
Health authority United States: Institutional Review Board
Study type Interventional

Clinical Trial Summary

This study examined how dieting with a partner affects weight loss, diet adherence, psychological well-being, and cortisol.


Description:

The goal of this study was to understand how different types of diet "buddy systems" affect diet success and outcomes related to dieting. Pairs of non-romantic cohabiting female dyads (i.e. roommates) were randomly assigned to one of the following three-week manipulations: (a) neither roommate dieted, (b) one roommate was assigned to a 1200-calorie/day diet and the other ate normally, (c) both roommates were assigned to a 1200-calorie/day diet. Both pre- and post diet, participants were weighted and measured, filled out psychological questionnaires, and provided two days of diurnal salivary cortisol samples. During the three-week manipulation period, participants who were assigned to diet recorded all calories consumed on each day. This study tested whether dieting in a pair would lead to improved diet outcomes in terms of adherence and weight loss, changes in psychological well-being, and changes in cortisol.


Recruitment information / eligibility

Status Completed
Enrollment 164
Est. completion date December 2014
Est. primary completion date December 2014
Accepts healthy volunteers Accepts Healthy Volunteers
Gender Female
Age group 18 Years and older
Eligibility Inclusion Criteria:

- Female

- Over 18 years of age

- Interested in dieting in the coming 12 months

- self-reported BMI over 18.5

- < 5 kg weight change in previous 3 months

- Have a university meal plan

- Have a roommate also willing/eligible to participate

Exclusion Criteria:

- Recent/current history of major medical disorder

- Pregnancy/lactation

- History of eating disorder

- Use of lipid-lowering medications

- Use of weight-altering/metabolism-altering medications

- Smoking

Study Design

Allocation: Randomized, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Basic Science


Related Conditions & MeSH terms


Intervention

Behavioral:
Mixed Diet Condition
One roommate dieted and the other ate normally.
Both Diet Condition
Both roommates dieted.

Locations

Country Name City State
n/a

Sponsors (1)

Lead Sponsor Collaborator
A. Janet Tomiyama

References & Publications (4)

Cohen S, Kamarck T, Mermelstein R. A global measure of perceived stress. J Health Soc Behav. 1983 Dec;24(4):385-96. — View Citation

Fairburn CG, Beglin SJ. Assessment of eating disorders: interview or self-report questionnaire? Int J Eat Disord. 1994 Dec;16(4):363-70. — View Citation

Radloff, L. S. The CES-D scale a self-report depression scale for research in the general population. Applied psychological measurement, 1(3): 385-401, 1977.

Spielberger CD, Gorsuch RL, Lushene RE. State-trait anxiety inventory (self-evaluation questionnaire). Consulting Psychologists Press: 1970.

Outcome

Type Measure Description Time frame Safety issue
Primary Psychological well-being measured via electronic questionnaires ~3 days after end of 3-week manipulation No
Primary Weight loss measured via pounds ~3 days after end of 3-week manipulation No
Primary Diet adherence measured via daily calorie counts up to 3-week No
Secondary Cortisol measured via 2 days diurnal cortisol 1 day after end of 3-week manipulation No
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