Although body dissatisfaction has been found in boys as young as age six, muscle dysmorphia's onset is estimated at usually between ages 18 and 20. According to DSM-5, muscle dysmorphia is indicated by the diagnostic criteria for body dysmorphic disorder via "the idea that his or her body is too small or insufficiently muscular", and this specifier holds even if the individual is preoccupied with other body areas, too, as is often the case.
Further clinical features identified include excessive conduct of efforts to increase muscularity, activities such as dietary restriction, overtraining, and injection of growth-enhancing drugs. Persons experiencing muscle dysmorphia generally spend over three hours daily pondering increased muscularity, and may feel unable to limit weightlifting. As in anorexia nervosa, the reverse quest in muscle dysmorphia can be insatiable. Those suffering from the disorder closely monitor their body and may wear multiple clothing layers to make it appear larger.
Muscle dysmorphia involves severe distress at having one's body viewed by others. Occupational and social functioning are impaired, and dietary regimes may interfere with these. Patients often avoid activities, people, and places that threaten to reveal their perceived deficiency of size or muscularity. Roughly half of patients have poor or no insight that these perceptions are unrealistic. Patient histories reveal elevated rates of diagnoses of other mental disorders, including eating disorders, mood disorders, anxiety disorders, and substance use disorder, as well as elevated rates of suicide attempts.
Although muscle dysmorphia's development is unclear, several risk factors have been identified.
Versus the general population, persons manifesting muscle dysmorphia are more likely to have experienced or observed traumatic events like sexual assault or domestic violence, or to have sustained adolescent bullying and ridicule for actual or perceived deficiencies such as smallness, weakness, poor athleticism, or intellectual inferiority. Increased body mass may seem to reduce the threat of further mistreatment.
As Western media emphasize physical attractiveness, some marketing campaigns now exploit male body-image insecurities. Since the 1980s, the number of fitness magazines and of partially undressed, muscular men in advertisements have increased. Such media provoke bodily comparisons and pressure individuals to conform, yet increase the gap between men's perceptions of their own muscularity versus their desired muscularity. In college-aged men, a strong predictor of a muscularity quest is internalization of the idealized male bodies depicted in media.
Athletes tend to share some psychological factors that may predispose to muscle dysmorphia, factors including high levels of competitiveness, need for control, and perfectionism, and athletes tend to be more critical of their own bodies and body weight. Athletes who also fail to their sports performance goals may escalate efforts to modify their builds, efforts that overlap those of muscle dysmorphia. Involvement in sports where size, strength, or weight, whether higher or lower, imply competitive advantage associates with muscle dysmorphia. Athletic ideals reinforce the social ideal of muscularity. Conversely, those already disposed to muscle dysmorphia may be more likely to participate in such sports.
Treatment of muscle dysmorphia can be stymied by a patient's unawareness that the preoccupation is disordered or by avoidance of treatment. Scientific research on treatment of muscle dysmorphia is limited, the evidence largely in case reports and anecdotes, and no specific protocols have been validated. Still, evidence supports the efficacy of family-based therapy, cognitive behavioural therapy, and pharmacotherapy with selective serotonin reuptake inhibitors. Also limited is research on prognosis of the untreated.
Prevalence estimates for muscle dysmorphia have greatly varied, ranging from 1% to 54% of men in the studied samples. Samples of gym members, weightlifters, and bodybuilders show higher prevalence than do samples from the general population. Rates even higher have been found among users of anabolic steroids. The disorder is rare in women but does occur, and has been noted especially in female bodybuilders who have experienced sexual assault.
Muscle dysmorphia has been identified in China, South Africa, and Latin America. Nonwestern populations less exposed to western media show lower rates of muscle dysmorphia.
Muscle dysmorphia was first conceptualized by healthcare professionals in the late 1990s. In 2016, 50% of peer-reviewed articles on it had been published in the prior five years.
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Foster AC, Shorter GW, & Griffiths MD (2015), "Muscle dysmorphia: Could it be classified as an addiction to body image?", J Behav Addict 4(1):1–5.
Foster AC, Shorter GW, & Griffiths MD (2015), "Muscle dysmorphia: Could it be classified as an addiction to body image?", J Behav Addict 4(1):1–5.
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