this seems pretty problematic, because they even "defined" bulimia IN the webtoon.... very incorrectly. When I saw the description I was really curious on how they would handle and incorporate the condition and was really hoping for good representation and recovery of the MC..... turns out it was NOT at all what i was expecting.
From what I know about the hormones, I think his overeating could be attributed his body not absorbing leptin. Leptin sends signals to the body signifying you're full, suppressing hunger, however there is a small minority of people who don't produce it or don't absorb it properly. This makes the people feel constantly hungry and overeat, so if there is damage to certain parts of his brain he may never feel "full". But it's just a fictional story, and the author did explain that it was a disease made up purely for this story not bulimia+ the main character doesn't exhibit behavior indicative of purging, a defining characteristic of bulimia, so it's not that deep
Idk if it helps but I saw somewhere there's actually a term called "Binge eating disorder" or sth if the person with bulimia doesn't purge (by any method vomiting, laxatives, fasting etc)
And translator logic about compensating vomit with over exercise is also plausible
I think translator has put it nicely here
So I don't think it was made up tho it is taken lightly.
http://www.mangago.zone/read-manga/levelling_up_by_only_eating/uu/mpn_chapter-2302950/pg-43/
Are we not gonna talk about how misrepresented bulimia is in this? no? mkay.