«In 2012, researchers led by a group at Yeshiva University analyzed the health outcomes of more than 90,000 women over an eight-year period and found that those who frequently attended religious services were 56% more likely than non-attending women to report high rates of optimism, and 27% less likely to report depression. Other studies of the same group found a 20% lower mortality rate.
Researchers at University College London found similar results in analyzing dozens of studies that examined the impact of religiosity among men and women. Numerous other studies by researchers at Harvard, Duke and other universities have found that religious identification and church attendance are associated with less social isolation, lower risk of substance abuse, lower rates of suicide, greater happiness and life satisfaction.
Yet believers should be wary of celebrating these findings too much. The faithful may be winning at the game of life, but they're playing by rules that social scientists have written in essentially post-religious terms. While churches define the highest aims of life as salvation or enlightenment, social science research replaces these with health and wealth, well-being and satisfaction.»
Ari N. Schulman: Does Faith Make You Healthier? - WSJ.com