If you have been moody and sad, unable to eat or sleep, chances are you suffer from clinical depression--unless, of course, it's just a bout of the blues. If you have a nasty habit of getting into brawls, chances are you are an antisocial personality--unless, of course, you are just a bit of a hothead. What determines whether you are sick or well? Often as not, it's whether you are male or female.
Diagnosing mental disorders has always been a tricky business, with doctors often relying on little more than observation, experience and the occasional hunch. Once the labels are applied,...