My definition of "ruin" is going from slim or average weight to morbidly obese, stretching the skin so it could never again be tight regardless of weight loss. Often this is coupled with permanent obesity and the resignation that one will never again be fit.
Although others define "ruin" as immobility and/or incapacitation, this along with death feeding, is too extreme for me.
I know some women at various stages of "ruin" outside of the fetish world. The ways they're "ruining" their bodies with obesity turns me on big time.
One acquaintance is very much into her looks yet can't help herself with eating. She went on psych meds a couple years ago to control bipolar disorder and began ballooning. So far the weight gain did nothing to curb her narcissism. She's cute and I find it hot how she's plumping up, going from 150ish to well over 200. Given her persona, I feel this "ruin" is driven by karma and totally deserved. The anticipation of not knowing when it'll end, nor if the obesity will eventually have a humbling effect is keeping me in suspense.
Another acquaintance has a total opposite personality, yet is on a similar ruinous trend. Sweet and down to earth, she's a little disheveled yet cute in a natural way. Going from tall and slightly overweight to a borderline SSBBW over the last five years, it was the Covid shutdown that really did her in. Standing her apron completely hides her fupa, and sitting in the car her belly touches the wheel. I find her gaining and carrying the weight ridiculously hot, yet I like her as a person and hope she can control it.
Basically seeing obesity "ruin" the body is appealing to me for different reasons based on the individual.
5 months