What about negative social backlashes against being that size, you become less willing to get out and socialise, you give up exercise, etc, and so this creates a snowball effect of depression, hellooo
Eating does seem to acquire a positive kind of 'soothing' effect for the depressed obese person
though being depressed doesn't generally lead to the obesity (although it can perhaps add to it to some degree) 
Let obese people live...They're far from body hatred, what I witnessed is a let-it-all-hang-out faith in themselves and a don't-give-a-damn attitude to their evident obesity
