Once There Was a Fat Girl — Cynthia Baxter

Martha Nowicki had progressed from chubby to fat without really noticing. And she always settled for less than she wanted. But when she was passed over for a promotion at her job, and her boyfriend Eddie deserted her, she knew she'd have to make a change. But even losing weight complicated things -- suddenly there were two men in her life, and two companies wanting her skills. Young Adult Fiction by Cynthia Baxter writing as Cynthia Blair; originally published by Fawcett