Whether you like (or hate) Justine - or Alison for that matter - please don't use their size as an excuse to slag them off publicly.
This kind of thing can have a very serious effect on people, and it can really destory self image and lead to all kinds of nasty illnesses. Besides that, it's childish to pick on someone's physical flaws.
I would never call Justine fat. I noticed she tends to wear clothes that are obviously too small for her which makes her look fatter than she actually is. But Jesus. I wouldn't want to live in a world full of skeletal women and there's no reason why any woman should feel they should 'aspire' to that.
But yeah, regarding this petition, I don't give two f***s about Justine either way, seeing as she will be off our TVs within days like every Big Brother non-entity. The more you talk about her and email RI:SE about her, the more Channel 4 will think she is a controversial and interesting contestant. Let them wilt and die of their own accord.