Sorry girls! After many requests all I could find out was the following..
Kristen Stewart drinks diet coke
She is often seen smoking cigarettes which is known to suppress appetite (but it will kill you so if you are planning to start up smoking to lose weight then don’t do it!)
She has been photographed going to various restaurants – this doesn’t really tell us much, at least it shows she eats sometimes lol
I did see a movie a long time ago with her in it and she was a lot younger. She still had the same very skinny frame. I am guessing she is naturally a thin girl but drinking diet coke indicates that she is watching her weight.

