These are a lot of very odd but intriguing questions.
I imagine waking up in a thin body would be very shocking. For as long as I’ve been aware of my body, it has been “overweight” and that experience has shaped who I am. But my body is just that - my body. I’m still in here, no matter what shape it’s in. I imagine it’d feel very alien at first, but then this situation would only ever happen as a result of some sort of supernatural occurrence anyway.
If I were to somehow become thin, overnight or not, I’d accept that change as something that was meant to happen, and adapt to it somehow. I don’t know, shit happens. It’d be weird and hard but I’ve found I can be quite resilient and reasonable when my neuroses don’t get the best of me.
Body image is learned through experience, human interaction, media influence, genes, ways of thinking passed down from parent to child, government influence, propaganda, raw emotion, and countless other things.
Also consider:
Sociologists suggest that a person‟s body-image is understood as the incarnate representation of ideologies of beauty, gender, age, physical ability, and sexual preference. Nonetheless, in spite of a diversity of discourses, these various disciplinary arguments insist the same point: body-image—especially when it is distorted, unhealthy, or negative—is nothing but a reflection or representation of a reality existing outside the individual‟s mind and body.
Phillip Vannini Dennis D. Waskul
In other words: it’s fucking complex.
Google “body image and cultural semiotics” and try to wrap your brain around that shit. I took a class during school on semiotics, it is very much fascinating to me.
As for defining eating disorders - I am not equipped to delve into that really, especially as I don’t have one. Nor do I partake in feedism. I will simply say that feedists make their own choices, happily. Those suffering from ED are not choosing that for themselves.
Accepting your body is just living. What would one be in denial of?