Despite the growing popularity of mHealth applications, their usage outcomes have received limited empirical attention. Drawing on server-level user activity data and an online survey (N = 384), this study examines the use of an mHealth application for weight loss to elucidate the ways in which it can help individuals harness the power of self-efficacy and group support to enact behavior change and accomplish their health goals. The results of structural equation modeling based on 6-month user activity data demonstrated that (a) self-efficacy had a positive impact on persistent food logging in an mHealth application; (b) social support received from a mobile group was positively associated with food logging and group participation; and (c) both food logging and group participation predicted weight loss success. Extending these findings, this study suggests theoretical and practical implications for designing individually tailored and evidence-based health intervention strategies using advanced mHealth technologies.

Obesity and being overweight often result in serious health problems. Despite growing awareness of the dangers associated with being overweight, many individuals struggle to lose weight. Investigators have identified social support as a key element in weight-loss attempts. Unfortunately, little has been done to investigate how people solicit social support from members of their pre-existing social network without a structured intervention. To address this limitation, I conducted in-depth interviews with 25 participants. Through grounded theory analysis of these interviews, I developed a typology of support management strategies used by overweight young adults when attempting to lose weight. I outline these strategies, their perceived success, and implications for future research in this article.

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Research has demonstrated that network support for a romantic relationship often plays a crucial role in the relationship's success. Despite this knowledge, it is not uncommon for romantic couples to encounter network opposition for their relationship, and little research has evaluated what the romantic partners do in this situation. Using “social contextual theory” as its foundation (M. R. Parks, , ), this study evaluates a previously proposed typology (J. P. Crowley, ) explicating the variety of strategies an individual can use to marshal support for his or her romantic relationship. In addition, the study examines different variables that can influence an individual's decision to use certain support marshaling strategies. Future applications of the typology and its implications are also explored.