Study warns men against excessive narcissism
January 24, 2012  15:38
The Daily Mail reports that as part of a study, psychologists asked 106 men and women to take personality questionnaires and took two saliva samples from them to measure levels of cortisol, a stress-related hormone. 

Men who showed 'unhealthy' levels of narcissism in the questionnaires also had high levels of cortisol, even in a relaxed situation. In women, this was not the case.

In other words, while a 'healthy' degree of narcissism is good for you, they say, too much can cause tension and in extreme cases lead to depression and personality disorders.

Read more here.
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