In a recent academic study, Kenneth Zucker found that the mental health outcomes for adolescents with gender dysphoria were very similar to those with the same mental health issues who did not have gender dypshoria. In other words, we have no proof that the gender dysphoria was responsible for the suicidal ideation or tendency to self-harm. It may have been the many other mental health problems that gender dysphoric adolescents so often bear.
