"Obesity" Isn't the disorder, 'Overeating' is. But I agree, it isn't nearly enough considered a true disorder. I think people see it as normal, non life threatening, non unusual. Which is so very wrong.
One of my friends wrote on FB that her doctor told her to lose 25kg and how crazy was that because she was a normal weight!! I was so tempted to write 'no you aren't, you should lose weight' but thats just too bitchy.