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It actually is a psychological dysfunction. Body Dysmorphic disorder causes the person to have a distorted view of their body. Read about it in Wikipedia. This disorder is responsible for other conditions like anorexia which is extremely difficult to treat.
These individuals are not retarded. They just have a serious psychological illness.
I also think there is a language barrier here and perhaps retarded wasn't the intended word. I think stupid would fit better at least for some of these guys.