Oi, this. Being overweight, while it can make itself a problem, is more often symptomatic of other problems. Trying to "fix" the weight alone often does more harm than good, so it's a lot more affective to treat the underlying problems and getting a person to their personal healthy body, whatever size that may be.

That said - if you compared the veggie anon above with me physically, people would probably say I'm the healthier one. And they'd be wrong. Just because I'm an average size doesn't mean I don't have health problems - and I'm probably lighter now than I was when I was an athlete and healthy simply because muscle weighs more than fat. In the same vein, just because somebody is overweight doesn't mean they actually have any problems at all!