A Norwegian study has now linked depression to heart failure.
Researchers from University of Cambridge have identified the first biomarker - a biological signpost - for major depression.
Parents and doctors, who assume eating disorders very rarely affect males, should reconsider again.
Low levels of vitamin D, linked earlier with cardio diseases and neurological conditions, are also tied with the blues.
Some teenagers smoke to puff away their blues, but it may actually end up worsening their depressive symptoms.
Bipasha at launch event for Delhi Half Marathon
Day in Pics: 28th August
August 28, 2014