Conditions like pradar-willi also cause learning difficulties and low intelligence, unfortunately they can't 'learn' to deal with hunger, they are mentally disabled.  This is the real version of the 'condishuns' that obeasts claim to suffer, unless they now class lazyness, greed, gluttony and lack of self control as 'condishuns'. She's fat because she eats too much but her 'carers' are to blame for allowing access to crap food.