I really can't understand why people are making such an issue out of this.
People have managed to assume that FB lost her weight through dieting, and now that she has advised (why 'admitted'? She didn;t lie about it.) that she has had a gastric band, people are behaving like this is some kind of massive betrayal.
Point One - we are a fat-ist society, but really the size, or not of Fern Britton is hardly news is it?
Point Two - she has lost weight, feels and looks better for it, who gives a flying one how she managed to do it?
Point Three - why are a load of complete strangers taking it upon themselves to feel put out because they allowed themselves to make an assumption about an aspect of a stranger's life that is none of their business - and then find out that things were not as they assumed?
Point Four - does anyone really care?