I feel like it's more or less the general consensus that just blindly accepting people who've become truly obese/overweight isn't a good thing, and at the same time just shaming them over their bodies is also no good. I'm especially against shaming in children, since as I previously mentioned, they don't exactly have control over their diet, only some of their exercise habits, and if those and a general health concerns aren't implanted at a younger age, it only becomes harder on them to improve with age, making shaming even worse and blind acceptance even more enabling.
Shaming anybody over their body image is, in my opinion, just a detestable thing to do. Unless you've known the person for a time, you've no real backing of their history to give you any proper rights to judge their body. It's just an asshole thing to do. Having a discussion with a person who is overweight/obese, and actually explaining to them why their weight can be a concern is a more positive and likely effective way to go about it, and ultimately, if they're an adult, it's then up to them to push towards healthier living, remain as they are, or sink further into unhealthiness, and even then sometimes their choices aren't as simple as that giving less moral backing towards shaming.
In a similar vein, I think blind acceptance is a form of evil as well, as it enables. It says "It's ok that your legs are going out, you shouldn't let society's standards get to you, you're beautiful because you're you." This kind of bogus logic to spare people's feelings just makes them less likely to attempt to do anything for their own benefit and lowers their chances at healthy living. If people dialed it back, and were more like "You shouldn't worry about the standards society places on body image, but I do worry that your weight can have negative impacts on your health. If you're comfortable as you are, then alright, I can accept that. Just give it some thought though, alright?" Then you can drop it there. Are you accepting of them? Yes. Are you still looking out for their best interests? Hell yes, even more so than the one who coddles adults like they're damn children, and gives fat kids extra cookies and ice cream so they're not sad that they can't see past their stomach.
And that's my rant.
An interesting thing I've been taught, and I do need to look more into it, is that fat cells are actually formed at a young age, before one goes into puberty, and then from that point on it's merely growing or shrinking the preexisting ones. The reason I find this interesting is that it means that if we better control the habits and weights of people at a younger age, they'll grow into adults with severely weakened risks of becoming overweight or obese.