Deakin University

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Planning to Lose Weight: Randomized Controlled Trial of an Implementation Intention Prompt to Enhance Weight Reduction Among Overweight and Obese Women

journal contribution
posted on 2007-07-01, 00:00 authored by A Luszczynska, A Sobczyk, Charles AbrahamCharles Abraham
Objective: The trial investigates the effects of augmenting an established weight-reduction intervention with implementation intention prompts. Design: Fifty-five overweight or obese women (ages 18 to 76 years; body mass index from 25.28 to 48.33) enrolled in a commercial weight reduction program were randomly assigned to either an implementation intention prompt or a control condition. Data were collected twice, with a time gap of 2 months. Main Outcome Measures: The primary outcome was participants' change in weight and body mass index from preintervention to follow-up. Results: Repeated measures analysis of variance revealed a significant Time x Condition interaction: On average, implementation intention prompt participants lost 4.2 kg (95% confidence interval = 3.19, 5.07), whereas control participants lost 2.1 kg (95% confidence interval = 1.11, 3.09). The change in frequency of planning mediated the effects of the intervention on weight and body mass index change. Conclusion: Among obese or overweight women participating in a commercial weight loss program, those who learn to form implementation intentions can achieve greater weight reduction. Planning facilitation is a key mechanism explaining enhanced weight loss generated by implementation intention formation. © 2007 American Psychological Association.



Health Psychology






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