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Hello, in the movie "The Devil wears Prada" I've heard one girl who is trying to lose weight saing " I'm just one stomach flu away from my goal weight. ..."

What does this mean?

Thank you.
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If she gets sick with stomach flu, she will vomit and/or not eat anything, so her weight will drop to the weight that she wants to maintain. (It is a joke, of course.)
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Lighten up, Anon. No one thinks that acquiring a stomach virus is a viable weight-loss strategy -- not even the writer who wrote the book or the script for the movie.

Yes, it's a serious problem for many young women. And yes, it was intended as a joke in the movie.
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Comments  
Mister Micawber

Thank you.
Even worse than the vomiting is the diarrhea and the ensuing loss of fluids, which can be life threatening. Rest assured, it is very much NOT a joke. Many girls and women die to achieve their "goal weight".Never heard of anorexia or bulimia?
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 BarbaraPA's reply was promoted to an answer.