Littman also discusses a form of madness where people believed they were made of glass, which is relevant. It shows how cultural mental health problems can be.

https://en.m.wikipedia.org/wiki/Glass_delusion

I think it's a female trait because conformity is a survival strategy with females. There's also a certain survival in mimicking illnesses, particularly vomiting behaviour. If the people you live and eat with are vomiting, they might have ingested something toxic and puking right now before you feel ill is a great idea under those circumstances.

MBP is a different kettle of fish. It's seeking attention and sympathy rather than adopting a delusion. Although I suspect attention seeking may be in issue on some of the social media seekers. Then that might come into classic Munchausen territory.

I think a lot of the ROGD cases just have some kind of mental health issues and this is the 'in' cause that can explain away their teen angst, rampant body dysphoria, and in a lot of cases butchness and in denial lesbianism.

We are going to look back on this is a decade the same way we look at the Satanic abuse BS from the eighties.