Possibly YA, character has eating disorder he/she names "Ed," has "stars" or "sky" in title

[Linda]

Not sure of when it might have been published. Character hears voice in head, and something about the voice being named "Ed" and Ed eventually moves on to another character by the end of the book.

[Orsolya Könyvtáros (formerly Memp)]

The Sky Between You and Me by Catherine Alene?

[Kris]

Google Books preview of The Sky Between You and Me by Catherine Alene - Memp's suggestion:

https://books.google.com/books?id=55E... There are different cover images.