About how many young people have body dysmorphic disorder?

Relatively low: It depends a bit on where you choose to call something a disorder, since nearly all of us have some body part or other that we dislike perhaps more than is warranted. However, surveys done in community samples suggest that the prevalence is roughly 1%.

As High As 1-2%: Bdd is characterized by a preoccupation with an imagined or trivial defect in appearance that causes clinically significant distress or impairment in social, occupational or other important areas of functioning. Bdd is believed to affect 1-2% of the general population and affects as many as 6-14% of those in mental health settings presenting with an anxiety or depressive disorder.