Depression affects about one out of five children, and when it goes untreated there can be tragic consequences. Deepening and recurring depression, substance abuse, and even suicidal behavior can increase.

A new study from the University of Haifa finds girls who spend more time on Facebook, the social networking Web site, are more likely to develop eating disorders.

High school seniors who are excessively sleepy during the day may be at an increased risk of depression, according to a new study.