Adherence
A theory-based group weight loss intervention significantly increases dietary fiber intake, which mediates weight loss, but fails to significantly increase objectively measured physical activity despite improvements in self-efficacy and social support for activity.
This structured group program helps people increase fiber intake, which leads to weight loss. However, it does not significantly increase physical activity levels, even though participants feel more confident and supported in doing so. For weight loss, prioritize increasing fiber intake through this structured approach rather than relying solely on increased physical activity.
The intervention resulted in significant improvements in fiber intake (M between-group difference = 5.7 g/day, p < .001) but not fat consumption (−2.3 g/day, p = 0.13), that were predictive of weight loss at both four months... and 12 months... While participants reported improvements in motivational and social support variables, there was no effect of these, or of the intervention overall, on physical activity.
Why this rating
Randomized controlled pilot trial with process evaluation, though small sample size (N=108) and pilot nature limit generalizability.
Source
Processes of behavior change and weight loss in a theory-based weight loss intervention program: a test of the process model for lifestyle behavior change
Fiona Gillison et al. · International Journal of Behavioral Nutrition and Physical Activity · 2015
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