Obesity is a public health problem influenced by behavioral patterns that span an ecological spectrum of individual-level factors, social network factors and environmental factors. Both individual and environmental approaches necessarily include significant influences from social networks, but how and under what conditions social networks influence behavior change is often not clearly mapped out either in the obesity literature or in many intervention designs. In this paper, we provide an analysis of recent empirical work in obesity research that explicates social network influences on eating behaviors. We argue that a relational rather than individualistic view of personhood should help us better understand the content and context of social network relations that inform health behavior choices. We introduce the concept of 'identity-constitutive affiliations' as the glue that binds these social relationships together. Finally, we outline the implications for public health ethics in the development of effective interventions to address overweight and obesity, leveraging the content and context of social network ties to reinforce healthy (or alter unhealthy) eating. More complex treatment of positive and negative behaviors stemming from social network connections should lead to more comprehensive theoretical models of health behavior change and more effective public health interventions.

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Arguments for and against direct-to-consumer drug advertising (DTCA) center on two issues: (1) the epistemic effects on patients through access to information provided by the ads; and (2) the effects of such information on patients' abilities to make good choices in the healthcare marketplace. Advocates argue that DTCA provides useful information for patients as consumers, including information connecting symptoms to particular medical conditions, information about new drug therapies for those conditions. Opponents of DTCA point out substantial omissions in information provided by the ads and argue that the framing of the ads may mislead patients about the indications, uses, and effectiveness of the drugs advertised. They also suggest that DTCA has a number of potentially negative effects on the doctor-patient relationship. The standard arguments appear to assume a simplistic correlation-more information means more agency for patients. However, empirical studies on medical decision making suggest that this relationship is much more complex and nuanced. I examine recent research on ways in which patients are vulnerable with respect to DTCA. In order to address the complex issues of information acquisition and consumer decision-making in the health care marketplace, the focus should not be simply on what information patients need in order to make medical decisions, but also on the conditions under which patients actually are able to make medical decisions requiring complex medication information. This requires examining both the cognitive limitations of patients with respect to drug information and investigating patients' preferences and needs in a variety of medical contexts.