Yes! A science question! (It feels like it’s been ages since Tony said a novel incorrect thing about a science-related topic.)
I had a very quick look and found two fairly recent systematic reviews:
From 2021:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8500372/
From 2019:
https://academic.oup.com/ajcn/article/109/5/1402/5480601
The figures for eating disorders vary a lot depending on what source you use, and so are difficult to assess as a whole, but overall it seems that rates have been roughly stable, with perhaps an increase in incidence in children under 15 in the past decade or two.
Anecdotally, a lot of younger troons seem to have eating disorders. There are two members of Zac & Tony’s extended polycule (witchbitchaddi and kateisdeflate/lainroses) who both have eating disorders. witchbitchaddi is due to have his stink ditch excavated in three weeks; Kat said he was having his balls removed this April but that doesn’t seem to have happened.
It seems to be reasonably common among young trans-identified females who feature in the SRS thread (having had both breasts amputated).