You can't diet away a nasty fat ass ugly soul.
75% of a woman's appearance is her attitude and demeanor. I've known thicker women than her who were beautiful because they were genuinely beautiful women. I've known thinner women than her who looked just as unattractive as she does all due to their attitude.
Dunham is nasty on the outside because she is nasty on the inside. Puking up a few meals isn't going to change that.
I did a photo-shoot for a young lady a month or so ago, who was quite larger than Dunham, but she was a complete doll because she had an infectious positive and happy personality. Her happiness effected her entire look, plus she took care of herself well even though she was large. Good posture, warm glow, someone you just want to be around.
Another person I work with has model looks. Tall, slim, strawberry blonde hair, completely in shape, but she has a very dark personality and unfortunately it comes across in her looks. Closed, moody, poor posture, you have to force a smile out of her. You just want the shoot to be over with.