(It wasn't particularly body-positive, let's just say, but I am looking for it anyway).
Anthology. I thought it was pretty mainstream, like Datlow or Greenberg or Dozois, but no matter how I search I cannot find it. It was not super-old, but not published in the last couple of years either. I don't think that it was small press.
Stories included, I think, one about a girl in hospital for anorexia who turns the tables on her family/captors, one about an immobilized woman who is rescued at the end by an EMT or firefighter, one where a group of spacers are captive and fed high-calorie, addictive food that only one of them realizes is intended to fatten them up.