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Obesity (Silver Spring). 2018 Mar;26(3):499-504. doi: 10.1002/oby.22098. Epub 2018 Feb 1.

Randomized Controlled Trial Examining the Ripple Effect of a Nationally Available Weight Management Program on Untreated Spouses.

Author information

1
Department of Psychological Sciences and the Institute for Collaboration on Health, Intervention, and Policy, University of Connecticut, Storrs, Connecticut, USA.
2
Department of Allied Health Sciences, University of Connecticut, Storrs, Connecticut, USA.
3
Weight Watchers International, Inc., New York, New York, USA.
4
Center for Weight and Eating Disorders, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Abstract

OBJECTIVE:

For married couples, when one spouse participates in weight loss treatment, the untreated spouse can also experience weight loss. This study examined this ripple effect in a nationally available weight management program.

METHODS:

One hundred thirty dyads were randomized to Weight Watchers (WW; n = 65) or to a self-guided control group (SG; n = 65) and assessed at 0, 3, and 6 months. Inclusion criteria were age ≥ 25 years, BMI 27 to 40 kg/m2 (≥ 25 kg/m2 for untreated spouses), and no weight loss contraindications. WW participants received 6 months of free access to in-person meetings and online tools. SG participants received a weight loss handout. Spouses did not receive treatment.

RESULTS:

Untreated spouses lost weight at 3 months (WW = -1.5 ± 2.9 kg; SG = -1.1 ± 3.3 kg) and 6 months (WW = -2.2 ± 4.2 kg; SG = -1.9 ± 3.6 kg), but weight losses did not differ by condition. Overall, 32.0% of untreated spouses lost ≥ 3% of initial body weight by 6 months. Baseline weight was significantly correlated within couples (r = 0.26; P < 0.01) as were weight loss trajectories (r = 0.52; P < 0.001).

CONCLUSIONS:

Evidence of a ripple effect was found in untreated spouses in both formal and self-guided weight management approaches. These data suggest that weight loss can spread within couples, and that widely available lifestyle programs have weight loss effects beyond the treated individual.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT03042208.

PMID:
29388385
PMCID:
PMC5838794
DOI:
10.1002/oby.22098
[Indexed for MEDLINE]
Free PMC Article

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