AuroraSaab
Squire
Anorexic children are often given olanzapine, an antipsychotic. Not because they have any psychotic symptoms but because the most common side effect of olanzapine is weight gain. This is a drug only licenced in 1991 for its original purpose and although there has been some research there doesn't appear to be much on children without psychotic symptoms.
A quick Google suggests they don't recommend it for under 13's and I would have thought that extensive therapy would remain the first port of call in anorexia treatment, not medication. I'd be surprised if you could get a prescription for it as an outpatient after only a couple of meetings with a doctor. It's also, presumably, a short term treatment, not one you are on for years. This meta review of 24 studies suggested it's beneficial in high doses, short term. It talks about taking it for 10 weeks, not years like puberty blockers and decades for cross sex hormones.
https://ejnpn.springeropen.com/articles/10.1186/s41983-020-00195-y
The analogy is interesting though. No-one ever suggests those suffering from anorexia need to change their body to match how they feel inside. Also the role of society pressure and social contagion in contributing to anorexia seems well documented, as does its prevalence amongst girls, which is the cohort of gender clinic referrals that has increased the most.