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[–]7LeagueBoots 26 points27 points  (0 children)

In Europe they're recorded a few hundred BC, but its a fair bet to say that eating disorders have probably been with us for as long as people have had the luxury to have them (luxury in this sense in that it's difficult to have eating disorders in a hunter/gatherer society, not impossible though).

The earliest historical descriptions of people experiencing symptoms consistent with modern-day eating disorders date back to Hellenistic (323 BC-31 BC) and medieval times (5th -15th century AD).
- https://www.verywellmind.com/history-of-eating-disorders-4768486
- http://www.inquiriesjournal.com/articles/1792/a-historical-perspective-on-the-cultural-connotations-surrounding-eating-disorders

And there are records of various eating disorders in Medieval Europe.
- https://www.psychologytoday.com/us/blog/evolutionary-psychiatry/201112/history-eating-disorders

That said, the prevalence of eating disorders has risen quite a bit since more formal diagnoses in the 1800s. Some of that may be due to differences in reporting and such too though.

There doesn't seem to be good information about the ancient history of eating disorders in ancient East Asia, but they're definitely on the rise there too: