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This study examined how dieting with a partner affects weight loss, diet adherence, psychological well-being, and cortisol.
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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Control Condition | No Intervention | Neither roommate dieted. | |
| Mixed Diet Condition | Experimental | Low-calorie diet: One roommate in each pair was randomly assigned to a 1200-calorie/day diet, while the other roommate was instructed to eat normally. |
|
| Both Diet Condition | Experimental | Low-calorie diet: Both roommates in each pair were randomly assigned to a 1200-calorie/day diet. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Mixed Diet Condition | Behavioral | One roommate dieted and the other ate normally. |
| |
| Measure | Description | Time Frame |
|---|---|---|
| Psychological well-being measured via electronic questionnaires | ~3 days after end of 3-week manipulation | |
| Weight loss measured via pounds | ~3 days after end of 3-week manipulation | |
| Diet adherence measured via daily calorie counts | up to 3-week |
| Measure | Description | Time Frame |
|---|---|---|
| Cortisol measured via 2 days diurnal cortisol | 1 day after end of 3-week manipulation |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| A. Janet Tomiyama, PhD | University of California, Los Angeles | Principal Investigator |
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| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| Background | Spielberger CD, Gorsuch RL, Lushene RE. State-trait anxiety inventory (self-evaluation questionnaire). Consulting Psychologists Press: 1970. | ||
| Background | 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. | ||
| 7866415 | Background | Fairburn CG, Beglin SJ. Assessment of eating disorders: interview or self-report questionnaire? Int J Eat Disord. 1994 Dec;16(4):363-70. | |
| 6668417 |
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| ID | Term |
|---|---|
| D000092862 | Psychological Well-Being |
| D015431 | Weight Loss |
| ID | Term |
|---|---|
| D010549 | Personal Satisfaction |
| D001519 | Behavior |
| D001836 | Body Weight Changes |
| D001835 | Body Weight |
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| Both Diet Condition |
| Behavioral |
Both roommates dieted. |
|
| Background |
| Cohen S, Kamarck T, Mermelstein R. A global measure of perceived stress. J Health Soc Behav. 1983 Dec;24(4):385-96. No abstract available. |
| D012816 |
| Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |