I am perhaps not a good one to criticise body images, being overweight myself, one being ancient, and two, having severe arthritis which limits my mobility. But, I can still make health observations for young women. And, the present cult of accepting being morbidly obsese is a killer for young women, and men too. Positive body image may involve rejecting being model thin, but it does not mean accepting being morbidly obese. Magazines are not helping here:
  https://www.naturalnews.com/2018-09-09-cosmo-magazine-now-celebrating-morbid-obesity-feminism.html#

“Cosmo U.K. just featured a size-26 model on the cover of their latest issue. While feminists and so-called body positivity activists are celebrating the fact that a 300-pound woman got to be on the cover of a popular magazine, many people are concerned about what kind of message this “activism” is really sending. No one would argue that body shaming is wrong, but is fat activism really the answer? Obesity is a top risk factor for virtually every major disease that plagues modern society: Heart disease, type 2 diabetes, and even cancer. Promoting healthy minds and bodies is not the same as promoting obesity, which is already rampant in most Western nations like the United States and the United Kingdom. Critics have been quick to point out the disparity between the two and have lambasted Cosmo U.K. for promoting unhealthy lifestyle choices.”

     Of course “fat shamming’ is wrong, but the issue here is one of health and the avoidance of a whole range of diseases that come with obesity. There are no arguments about these health dangers, which have been known for decades. Making this issue into a feminist one, rather than a health issue, will not be helping young women, who discover a few years down the track that they are type II diabetic and/or suffering from cardio-vascular disease, and/or cancer.