Recent scientific work has established both a theoretical basis and strong empirical evidence for a causal impact of social relationships on health. Prospective studies, which control for baseline health status, consistently show increased risk of death among persons with a low quantity, and sometimes low quality, of social relationships. Experimental and quasi-experimental studies of humans and animals also suggest that social isolation is a major risk factor for mortality from widely varying causes. The mechanisms through which social relationships affect health and the factors that promote or inhibit the development and maintenance of social relationships remain to be explored.

Social relationships—both quantity and quality—affect mental health, health behavior, physical health, and mortality risk. Sociologists have played a central role in establishing the link between social relationships and health outcomes, identifying explanations for this link, and discovering social variation (e.g., by gender and race) at the population level. Studies show that social relationships have short- and long-term effects on health, for better and for worse, and that these effects emerge in childhood and cascade throughout life to foster cumulative advantage or disadvantage in health. This article describes key research themes in the study of social relationships and health, and it highlights policy implications suggested by this research.

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Sociological theory and research point to the importance of social relationships in affecting health behavior. This work tends to focus on specific stages of the life course, with a division between research on childhood/adolescent and adult populations. Yet recent advances demonstrate that early life course experiences shape health outcomes well into adulthood. We synthesize disparate bodies of research on social ties and health behavior throughout the life course, with attention to explaining how various social ties influence health behaviors at different life stages and how these processes accumulate and reverberate throughout the life course.

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We work from a life course perspective to assess the impact of marital status and marital transitions on subsequent changes in the self-assessed physical health of men and women. Our results suggest three central conclusions regarding the association of marital status and marital transitions with self-assessed health. First, marital status differences in health appear to reflect the strains of marital dissolution more than they reflect any benefits of marriage. Second, the strains of marital dissolution undermine the self-assessed health of men but not women. Finally, life course stage is as important as gender in moderating the effects of marital status and marital transitions on health.Married individuals are, on average, healthier than their unmarried counterparts, and men appear to receive more benefits from marriage than women (Hemstrom 1996;Lillard and Waite 1995;Rogers 1995). Recent research, however, raises serious questions about this general conclusion. An alternative explanation is that marital status differences in health result from the substantial but transient strains of marital dissolution. Despite much speculation about the processes responsible for marital status differences in health, most attempts to answer this question have been constrained by the use of cross-sectional data. We employ nationally representative longitudinal data to examine the impact of transitions into and out of marriage on the self-assessed health status of men and women. Further, we consider whether the effects of marital transitions on men's and women's physical health endure or attenuate with time.We also integrate a life course perspective with research and theory on marriage and health to investigate whether the benefits of being married or the strains of marital dissolution differentially affect the health of young, mid-life, and older men and women. The life course perspective suggests that the timing of role transitions and statuses influences their effects on well-being (Elder 1985; see George 1993). Applying a life course framework to research

This article reviews recent research (1999 – 2009) on the effects of parenthood on wellbeing. We use a life course framework to consider how parenting and childlessness influence well-being throughout the adult life course. We place particular emphasis on social contexts and how the impact of parenthood on well-being depends on marital status, gender, race/ethnicity, and socioeconomic status. We also consider how recent demographic shifts lead to new family arrangements that have implications for parenthood and well-being. These include stepparenting, parenting of grandchildren, and childlessness across the life course.

We work from a life course perspective and identify several reasons to expect age and gender differences in the link between marital quality and health. We present growth curve evidence from a national longitudinal survey to show that marital strain accelerates the typical decline in self-rated health that occurs over time and that this adverse effect is greater at older ages. These findings fit with recent theoretical work on cumulative adversity in that marital strain seems to have a cumulative effect on health over time-an effect that produces increasing vulnerability to marital strain with age. Contrary to expectations, marital quality seems to affect the health of men and women in similar ways across the life course.