D and Carol Colman.
Depression is the most common of all emotional disorders.
Extreme stress can trigger depression. Recent research shows that some people are biologically programmed to react with depression when they are over stressed. Poor diet and nutritional deficiencies can contribute to feeling blue. Nearly all of us have felt depressed at some point in our lives and, very often, within a short time we bounce back to normal. But when the depression doesn't lift within a week or two, it may be a sign of clinical depression , a bona fide health problem that may worsen if it is not effectively treated.