Body positivity, if kept within the scope of reason, is great.
I remember crushing on Keira Knightley when I was sixteen -- I still kinda do -- and thousands of people were ridiculing her for being anorexic, or promoting "unrealistic" body images.
I never believed that about Keira Knightley, and I still don't, because there have been plenty of people in my life who are temperamentally thin. I've seen ninety pound women scarfing down pizza pockets. Some people are mesomorphs, some people are ectomorphs, some people are endomorphs. It shouldn't be a source of shame to live in the body you have.
That said, anorexia is a mental illness, and it's deadly. It's not healthy. Somehow, the woke mob hasn't come out in droves to create a "phobia" when people express concerns that anorexic people aren't healthy. If I'm worried about you because you're starving yourself to the point that it's a struggle to stand up, I can say that. If a dickbag wants to shame a woman for being skinny, apparently the woke mob is okay with it.
The fat positivity movement, isn't the same as body positivity.
There's a massive middle ground between being an asshole to people who put on a few extra pounds, and the cover of Cosmo featuring an obese person with the caption, "This is healthy."
The woke, illiberal Left isn't great at killing people with guns, or knives, or blunt objects; but, the woke, illiberal Left is great at killing people through lies.
No, you can't be a healthy person while being obese. That claim is as ludicrous as me claiming that I was a healthy alcoholic the day before I had to be hospitalized.
Still, we have this horrifying community of people, who demand that you can be healthy regardless of your life choices in regard to weight. This community will shut out any person who warns of the risks of being fat. They shun people who make the choice to try to be healthier. They lie, and people die.
Jamie Lopez was, at one point, so obese that she couldn't walk. She lost some weight, and relearned how to walk; but, the damage had already been done. She kept killing herself because a bunch of you assholes created a culture in which she was fed the myth that her obesity was healthy, and she knew that losing the weight meant losing the money and the support that you assholes were giving her. She knew that, if she got healthy, she'd become a target of the left.
She's the body positivity version of detransitioners who have become fatality victimized by the lies of the woke, illiberal Left. She believed their bullshit, and it killed her.