Cohort profile: The biopsychosocial religion and health study (BRHS).

How did the study come about? In The Secrets of Long Life in the National Geographic Buettner explored longevity among three communities in Sardinia Italy, Okinawa Japan, and Loma Linda California. Loma Linda is largely a community of 7th-day Adventists. In 1969 initial research found that among individuals surviving past age 35 Adventist women in California lived 3.7 years longer than their counterparts and Adventist men 6.2 years longer. In a later, larger California sample the differences were even stronger—4.4 years for women and 7.3 years for men. Exercise, vegetarian diet, not smoking, eating nuts and social support have been found to predict longevity in Adventists. Yet even when these and several psychological variables are controlled church attendance still predicts greater longevity. Interest has been increasing regarding the association of both mental and physical health with religion or spirituality. There have been a number of literature reviews that have concluded that the associations of religion and health are largely positive. In fact, Hall concluded religious attendance was more cost-effective in increasing longevity than statin-type medications. While some have questioned the quality of these research conclusions and others have pointed out that the benefits or costs of religion may vary depending on the indicator of religious involvement, there is general agreement regarding the need for more and better research on the subject. Nonetheless, Hummer and his colleagues concluded there was consistent evidence that religious attendance was associated with lower mortality risk in cross-sectional and prospective studies. They also concluded there was a need for more diverse measures of religious involvement, comparison among specific subpopulations, and a better understanding of the pathways by which religion might influence health (p. 1226). It was with this goal in mind that this Biopsychosocial Religion and Health Study was developed.