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Married people have lower levels of the stress hormone cortisol than those who never married or were previously married, new research shows. This evidence lends support to the belief that unmarried people face more psychological stress than married individuals do.

Prolonged stress is associated with increased levels of cortisol, which can interfere with the body’s ability to regulate inflammation, which in turn promotes the development and progression of many diseases.

“It’s is exciting to discover a physiological pathway that may explain how relationships influence health and disease,” says Brian Chin, a PhD student in Carnegie Mellon University’s psychology department.

Over three non-consecutive days, the researchers collected saliva samples from 572 healthy adults aged 21-55 years. Multiple samples were taken during each 24-hour period and tested for cortisol.

The results, published in Psychoneuroendocrinology, show that the married participants had lower cortisol levels than the never married or previously married people across the three-day period. The researchers also compared each person’s daily cortisol rhythm—typically, cortisol levels peak when a person wakes up and decline during the day. Those who were married showed a faster decline, a pattern that has been associated with less heart disease, and longer survival among cancer patients.

“These data provide important insight into the way in which our intimate social relationships can get under the skin to influence our health,” says laboratory director and coauthor Sheldon Cohen, professor of psychology.

The National Center for Complementary and Integrative Health funded the preparation of this article.

Source: Carnegie Mellon University