Whereas people with "regular old depression" tend to be highly vulnerable to psychological stress, one way of thinking about bipolar disorder is that it is a condition of extreme sensitivity to the circles of time.

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She threw in slight OCD (obsessive-compulsive disorder) for good measure, to which I scoffed, thinking of the clothes strewn about my house.

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But in the case of anorexia, bulimia and, possibly, obsessive-compulsive disorder, Dr Fetissov's work opens a new line of thinking about how these diseases might be treated.

ECONOMIST: Psychiatric disorders and immunity