Muscle Dysmorphia is a specifier for which disorder?

Muscle Dysmorphia is indeed a specifier for Body Dysmorphic Disorder (BDD). This condition involves a preoccupation with perceived flaws or defects in one's physical appearance, which can lead to significant distress and impairment in daily functioning. In the case of Muscle Dysmorphia, individuals become excessively focused on the muscularity and fitness aspects of their bodies, often believing that they are not sufficiently muscular or lean, despite having a normal or even above-average physique.

This specific preoccupation with muscle size and definition falls under the umbrella of Body Dysmorphic Disorder, where the distorted body image primarily revolves around muscles rather than other features typically addressed in BDD. The focus on muscularity can lead individuals to engage in compulsive behaviors, such as excessive weightlifting, extreme dieting, or the use of anabolic steroids, as a way to try to "correct" the perceived imperfections they associate with their body image.

The other disorders listed do not share the same connection to muscle-focused body image concerns, thus making Body Dysmorphic Disorder the correct association for Muscle Dysmorphia.