Recommended Reading: In Clothes Called Fat (1997)
Just finished reading this. Arguably bad art (the cover has been updated for later printing, the inside is very different), the story and theming is stellar though - A bare-faced look at a woman's struggle with her weight, and the superficiality of humans. Short too, only 15 chapters, and it being only 1 Volume means it's cheap too, picked it up for £6 and it's one of the best manga I've read I think.
Fun note about the author, this is written by Moyoco Anno, wife of Hideaki Anno, famed director of Neon Genesis Evangelion.