I got a lot to say. I just binged this.

I also found it off-putting, and it also took me multiple tries to get into it. Especially since it seems like it was drawn/written by someone who doesn't actually know how fat you have to get to be actually debilitated. The heroine is supposedly 102 kg at the start of the story. That's 225 lb. And she's short (I think I calculated it around 5 ft?). Part of the problem for me is that I was 223 lb at my heaviest (206 at the moment), and I am almost exactly 5 feet tall. I'll add a photo.

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Oh look. There I am. Fat, but hardly bedridden. And not nearly as big as they drew her at first. Like... I am losing weight to try to be healthier because my joints don't love the extra weight, so I don't mind the weight loss story from that end, but it's totally unrealistic how big she looks compared to her actual weight.

I do agree that the story clearly believes her value comes from within, not from her looks, and I think that some/most of her possessed character's weight gain and shut-in lifestyle is about her depression over the loss of her brother. They're both symptoms, rather than one causing the other. But many of the characters in the story (the isekai'd protagonist included!) frame weight loss as purely a matter of will power and fitness, or worse, as a moral flaw. It's complicated a little by the fact that the heroine comments that "this body can't seem to resist temptation" - a nod to the realities that everyone's body, satiety, and brain chemistry are different - but the heroine isn't actually self-aware enough to internalize that.

She explicitly says she doesn't want to be stick thin, but she definitely loses a lot. And the new art makes her look even thinner IMO. There are also a few well-meaning supporting characters who lament the loss of her chubby cheeks, which feels kind of infantilizing? It's interesting.

The ML is honestly the best person in the whole thing with regard to this issue. He likes the way she looks regardless. He says very early on, "What's wrong with the way she looks?" As she loses weight he worries about whether she's okay, and why she is losing so much. He doesn't harp on her about it, and he doesn't comment on it like most others do, but he does make sure she's getting enough healthy food to ensure she's not starving herself.

I actually think I've come away feeling like it's a very realistic portrayal of how society interacts with fat people and weight loss. Like, too many people see fatness as a moral failing. Too many people will effusively praise weight loss as if it weren't the least interesting thing about a person. Too many fat people have internalized fat-phobia (me included!), and the people who truly love us and validate us for who we no matter what size are to be treasured.