The foundation of diabetes management is the self-care behavior of the patient. All of the systems within which the person with diabetes interacts, as well as the media and broader social and cultural values, affect this self-care behavior. In this article I focus on recent research that has examined the link between relationships in the patient’s intimate network (ie, family and close friends) and in the patient’s exchange network (ie, patient-provider relationship, Internet support). The goal of this review is to identify relational targets associated with self-care behaviors that are potentially modifiable within the diabetes medical care setting. Evidence-based suggestions are made for points of intervention entry, and areas for future research are explored.