Why does my sister watch fat people?

I have a 20 year old sister who constantly watches documentaries about fat people especially when shes eating I always catch her watching fat people and she denies it.Her weight is almost a 112 lbs and she always says that she is so fat and she wants to lose weight.I think she has issues and I think maybe she watches these obese people because it makes her feel skinny and she eats while watching them because it dosent make her feel guilty about the food she eats.I am not sure whats wrong with her what do you guys think?

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She is just plain terrified of getting fat. No wonder the bad attitudes towards fat people are varied, from outright hate, to subtle judgment and rejection. In the later case people would say they are just being over sensitive, they have no idea of the constant negative messages people direct toward those with extra weight. It all adds up to nothing less than harassment, that's not an exaggeration.

• maybe nothing's wrong and you should stop being to goddam paranoid and let her do what she wants
  
  get a life or something
• 112 ain't fat you idiot
• Maybe she has an eating disorder.