Mental health hasn’t historically been a strong point for medicine, but as researchers have been producing increasingly large bodies of work we’ve had to update our references to match the current understanding of what causes these problems. A bunch of new additions to the ICD-11 reflect changes that the DSM-5 (the reference book for American mental health professionals) has already recognized. These include body dysmorphic disorder, hoarding disorder, excoriation disorder, binge eating disorder, and avoidant/restrictive food intake disorder. Several of these are the result of an evolving understanding of other disorders. Binge eating disorder, for instance, would have previously been called bulimia nervosa, but people with binge eating disorder aren’t following their episodes with efforts to prevent weight gain (the classic methods would be self-induced vomiting or intense exercise). Similarly, avoidant/restrictive food intake disorder may look a lot like anorexia nervosa, except that those with ARFID aren’t following an abnormal eating pattern because they’re concerned about their weight. Hoarding also used to be lumped in with any number of other behavioral disorders, from OCD to depression to schizophrenia, but years of research have now shown it’s a distinct, unique disorder in and of itself.