Randomized Controlled Experiment of Dieting in Pairs

Dietary Modification Clinical Trial

Official title:

Randomized Controlled Experiment of Dieting in Pairs

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02898844
• Other study ID #: 13-000666
• 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

• Dietary Modification

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