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Int J Obes (Lond). 2017 Oct 9. doi: 10.1038/ijo.2017.251. [Epub ahead of print]

An experimental therapeutics test of whether adding dissonance-induction activities improves the effectiveness of a selective obesity and eating disorder prevention program.

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1
Oregon Research Institute, Oregon Research Institute, Eugene, Oregon, USA.

Abstract

OBJECTIVE:

Compare the Healthy Weight obesity and eating disorder prevention program, which promotes participant-driven gradual lifestyle changes to bring energy intake and expenditure into balance, to a new intervention, Project Health, which adds activities to create cognitive dissonance about unhealthy eating, a sedentary lifestyle, and excess body fat, and an obesity education video control condition.

METHOD:

College students at risk for both outcomes because of weight concerns (N=364, 72% female) were randomized to condition, completing pretest, posttest, and 6, 12, and 24-month follow-up assessments.

RESULTS:

Project Health participants showed significantly smaller increases in measured BMI through 2-year follow-up than both Healthy Weight participants and controls (both d=-0.18), and significantly lower onset of overweight/obesity over 2-year follow-up than Healthy Weight participants and controls (13% vs 21% and 22%). Healthy Weight and Project Health participants showed significantly greater eating disorder symptom reductions than controls through 2-year follow-up. Healthy Weight and Project Health participants showed marginally lower eating disorder onset over follow-up than controls (3% &3% vs 9% respectively).

CONCLUSIONS:

The reduced increases in BMI and future overweight/obesity onset for Project Health relative to both an active matched intervention and a minimal intervention control condition are noteworthy, especially given the short 6-hour intervention duration. The reduction in eating disorder symptoms for Healthy Weight and Project Health relative to controls was also encouraging. Results suggest that adding dissonance-induction activities increased weight loss effects. Yet, effects for both were generally small and the eating disorder onset prevention effects were only marginal, potentially because intervention groups included both sexes, which reduced eating disorder incidence and sensitivity.International Journal of Obesity accepted article preview online, 09 October 2017. doi:10.1038/ijo.2017.251.

PMID:
28990590
DOI:
10.1038/ijo.2017.251
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