Obesity can take the form of an eating disorder, but I can tell you that teenage girls aren't "pinning" photos of morbidly obese people and ending up in a spiral that lands them in hospital.
But I hope parent commenter never has to live personally through finding out just how life destroying the predominant cultural attitudes around body form & food around us are. I wouldn't wish it on my worst enemy. Obesity is by far the least of concerns.
Honestly, most of the people I know who have serious problems with obesity have some kind of metabolic disorder. Diabetic or pre-diabetic.
And I think this has become far more common than people will admit. We're burning out our pancreases through processed & high sugar, low-GI foods because the industrial food supply is poorly managed and under-regulated.