Researchers have examined social relationships as a basic need, showing that being well integrated in a network of social ties is related to various positive health outcomes including reduced mortality and risk behavior (e.g. reduced alcohol consumption). Conversely, a lack of strong social ties is related to negative outcomes including depression, suicide, and substance use (Berkman & Syme, 1979; Durkheim, 1951; Sarason, Sarason, & Gurung, 2001). Loneliness, a negative affective experience resulting from relationship deficits, is related to similar health outcomes as social isolation including depression and problematic alcohol use (Cacioppo, Hawkley, Crawford et al., 2002). However, research to date examining loneliness and health behavior has predominantly employed cross-sectional measures (e.g. UCLA Loneliness Scale; Russell, Peplau, & Cutrona, 1980), therefore failing to capture more fluctuating experiences of and responses to loneliness which may signify maladaptive patterns of coping behavior (Hawkley, Burleson, Bernston, & Cacioppo, 2003; Shankur, McMunn, Banks, & Steptoe, 2011). The purpose of this present study was to examine responses to daily loneliness (i.e. social and solitary alcohol consumption) as a function of social integration and gender, through a secondary analysis of data collected in a larger daily process study. Results indicated that daytime loneliness predicted evening increases in solitary consumption and decreases in social consumption. Further, these within-person effects were influenced by gender and social integration. These findings provide a unique understanding of specific processes by which social relationships, or the perceived lack thereof, influence health and more specifically, mood-related health behavior.

The longitudinal relationship between loneliness and depression as predictors of chronic health conditions in middle-aged to older adults was investigated utilizing data collected by the Health and Retirement Study (HRS), a national representative longitudinal study of health, retirement, and aging, conducted by the Institute for Social Research (ISR) Survey Research Center (SRC) at the University of Michigan, funded by the National Institute on Aging and the Social Security Administration. The correlation between these loneliness and depression was moderate (r = .32 to r = 51). The single-item subjective self-report of loneliness was found to be an adequate measure of loneliness. A cross-lagged panel correlation and regression design was used to examine the longitudinal relationship between loneliness, depression, and chronic health conditions. A temporal precedence was indicated implying a causal relationship with depression leading to subsequent loneliness. The relationship between recurring loneliness and chronic health conditions was weak (r = .13).