Wang, Ye, and Erin Willis. "Supporting self-efficacy through interactive discussion in online communities of weight loss." Journal of Health Psychology 23.10 (2018): 1309-1320.

This study conducted a content analysis of online communities linked to Weight Watchers' online message boards, investigating the correlation between conversational interactivity and consumer-generated content related to health information, self-efficacy, and experiences with dieting and physical activities. Results indicate that discussions about successful weight loss experiences tended to be more interactive, while those about consumer health information were less so. The findings suggest that interactive discussions about success stories foster social support within online communities, which, in turn, sustains active participation.