This is of particular concern because there's a direct link between stress, anxiety, depression and chronic disease.

CNN: Stress may be causing your cravings

Drugs, food and habitual behaviors all have a direct effect on the biology of stress.

CNN: Stress may be causing your cravings

Military experts have long said one of the enduring challenges is that there doesn't appear to be a direct link between suicides and the stress of being in the combat zone.

CNN: 325 Army suicides in 2012 a record

The symptoms of vicarious trauma, also called secondary traumatic stress, parallel those of direct trauma, said Laurie Anne Pearlman, former president of the Trauma Research, Education, and Training Institute Inc. and author of several books about vicarious trauma.

CNN: Treating trauma victims may cause its own trauma

The study does not allow a direct comparison of men and women's stress coping mechanisms, because only men were included.

MSN: Stress turns guys into social butterflies