I'm a bit confused with this article. I'm not a body positive influencer but I was indeed once one of those "straight sized women" who aren't fat and yet who felt that they were. I had an actual eating disorder.

I wasn't "subconsciously making out that I did", I actually did.

Yes it's a mental illness. Never would deny that. I also agree with you that abuse from my mother heavily factored into it. I do think however that societal beauty standards like a "thigh gap" also were influential because I would never have known what a thigh gap was if it hadn't been a big trend and shown in the media as desirable in the early 2010s. As such having a thigh gap became one of the things my eating disorder fixated on.

I don't know what you're talking about when you're saying that thin influencers "pose unnaturally to appear fatter than they are". I have never seen this. I've seen normal sized women sitting forward in poses that ARE natural where their stomach creates rolls though. But then, I don't use Instagram so maybe I have missed a whole segment of the body positive community.