A Matter Of Belief or Evidence
Tuesday, June 10, 2008
An integral part of many people's lives, religion defines patterns of worship and socialization, but its impact, if any, on health is unclear. Some studies show a benefit to religious practice, while others -- including much of the research into prayer -- fail to prove its health value.
The question of the role something as unquantifiable as religious belief might play in health troubles some scientists in an age when mainstream medicine is turning ever more toward epidemiological science to define research protocols and to determine the validity of treatments.
That said, it's not hard to understand why being religious might be good for the body, experts say. Religious people often attend regular services; this puts them in a socially supportive environment, which has widely acknowledged health advantages. And some religions promote healthful diets and discourage unhealthy behaviors such as drinking alcohol and smoking.
"Religions package many of the ingredients of well-being to make them accessible to people," said Richard Eckersley, a visiting fellow at the National Centre for Epidemiology and Population Health at the Australian National University in Canberra. And the "psychological well-being" that religion can promote is "linked to physical health through direct physiological effects, such as on neuroendocrine and immune function, and indirect effects on health behaviors, such as diet, smoking, exercise and sexual activity."
Interest in researching the impact of religion and spirituality on how we live seems to be surging. David Myers, author of "A Friendly Letter to Skeptics and Atheists" (to be published in August) and a professor of psychology at Hope College in Holland, Mich., did a database search to compare recent and past interest in the topic. Between 1965 and 1999, 1,950 study abstracts mentioned religion or spirituality, he found. Myers's search for the same terms in abstracts published between 2000 and 2007 came up with 8,719 hits, he said.
Among that research is some evidence that religion and spirituality offer health benefits and even longer life spans. A national survey conducted by the Centers for Disease Control and Prevention and mentioned in Myers's book found that people who did not attend religious services were 1.87 times more likely to have died during an eight-year period than those who attended services more than weekly. The life expectancy for infrequent attendees was age 75, and it was 83 for those who attended frequently.
A 1996 study looked at the association of Jewish religious observance with mortality by comparing secular and religious kibbutzim in Israel. Belonging to a religious group appeared to prolong life, and the lower mortality rates seen in the religious group were consistent for all causes of death, the authors wrote. And a 2003 study published in Psychosomatic Medicine found that meditation might alter brain and immune function in positive ways, an effect similarly seen in research involving Buddhist monks.
But researchers have had trouble replicating such statistics in the randomized studies that are the gold standard for medical research. It's hard to show conclusively whether or how a belief system affects one's health; other life experiences might provide benefits to health so similar to religion and spirituality that it's hard to differentiate.
Despite the lack of scientific evidence, some common religious practices are widely thought to enhance health.
It's not unusual for people to pray for their own health and for that of others. In a 2004 survey of more than 31,000 people, 45 percent said they'd prayed for health reasons, 43 percent prayed for their own health, and 25 percent reported that others had prayed for them. About 10 percent said they'd participated in a prayer group for their health, according to the results, released by the National Center for Health Statistics and the National Center for Complementary and Alternative Medicine.
But science says that prayer might not help a person who is ill. A 2003 update to an earlier systemic review of clinical trials on distant healing found that intercessory prayer, which involves someone praying for the healing of a person located elsewhere, with or without that person's knowledge, probably doesn't offer specific therapeutic healing effects.
Any benefit seen from prayer might come from the fact that "knowing that your friends and family are praying for you is part of social support, . . . and [that is] probably really helpful to people, independent of if there is a higher being that answers those prayers," said David G. Schlundt, an associate professor of psychology at Vanderbilt University, who has researched the connection between faith and health.