Do images of a personalised future body shape help with weight loss? A randomised controlled study
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Background: This randomised controlled study evaluated a computer-generated future self-image as a personalised, visual motivational tool for weight loss in adults. Methods: One hundred and forty-five people (age 18-79 years) with a Body Mass Index (BMI) of at least 25kg/m2 were randomised to receive a hard copy future self-image at recruitment (early image) or after 8weeks (delayed image). Participants received general healthy lifestyle information at recruitment and were weighed at 4-weekly intervals for 24weeks. The image was created using an iPad app called 'Future Me'. A second randomisation at 16weeks allocated either an additional future self-image or no additional image. Results: Seventy-four participants were allocated to receive their image at commencement, and 71 to the delayed-image group. Regarding to weight loss, the delayed-image group did consistently better in all analyses. Twenty-four recruits were deemed non-starters, comprising 15 (21%) in the delayed-image group and 9 (12%) in the early-image group (?2(1)=2.1, p=0.15). At 24weeks there was a significant change in weight overall (p<0.0001), and a difference in rate of change between groups (delayed-image group: -0.60kg, early-image group: -0.42kg, p=0.01). Men lost weight faster than women. The group into which participants were allocated at week 16 (second image or not) appeared not to influence the outcome (p = 0.31). Analysis of all completers and withdrawals showed a strong trend over time (p<0.0001), and a difference in rate of change between groups (delayed-image: -0.50kg, early-image: -0.27kg, p=0.0008). Conclusion: One in five participants in the delayed-image group completing the 24-week intervention achieved a clinically significant weight loss, having received only future self-images and general lifestyle advice. Timing the provision of future self-images appears to be significant, and promising for future research to clarify their efficacy. Trial Registration: Australian Clinical Trials Registry, identifier: ACTRN12613000883718. Registered on 8 August 2013.
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