Such a Pretty Face by Cathy Lamb
This one's a little longer than most, but it's a great read! I never found myself bored and wishing the book would move faster. The jumps back and forth between past and present help keep you attention as you follow the life of Stevie Barrett as she comes to terms with her experiences, her body, and herself.
Booklist review from Amazon.com:
In Such A Pretty Face, author Lamb does not skirt around her heroine’s many problems. The book opens with a tragic memory from Stevie Barrett’s childhood that would go on to define her life, and she eventually finds herself entirely alone and dangerously overweight. Her life is a restricted one in which she contantly feels secluded and lonely. After she undergoes weight-loss surgery and loses so much weight that she is literally half the woman she once was, Stevie slowly begins her own healing process. However, her path to healing is not a smooth one, and she soon finds herself facing many troubles: she runs into difficulties at the law office where she works, suffers from a crippling shyness around the opposite sex despite her new slim figure, realizes that her best friend is unsupportive, and must deal with a strained relationship with the aunt and uncle who took her in so many years ago and whose anniversary party she now must plan. Lamb writes Stevie’s story with humor and brutal honesty, and the result is an affecting portrait of one woman’s heroic journey from tragedy to her own version of happiness. --Claire Orphan