I looked up the fatty's FB page. Many pics were FA and fat activism. So yes, changing its diet WOULD change who it is. Her whole identity is around being fat. If she stopped being fat, then what is she? To us, human. To her, nothing. That's why she can't even contemplate that fat causes health problems and early death - because to do so would force her to face reality. Reality is scary. Yikes, better eat another donut.