How is Jemima changed by her online relationship with Brad in the novel, Jemima J.: A Novel About Ugly Ducklings and Swans?

When Jemima discovers the world of online dating, she meets Brad, a wealthy, buff, handsome man in California. Jemima pretends to be thin, and the two begin an online relationship. As she talks more to Brad, she finds the willpower she needed, and begins losing weight. She joins a gym, and becomes obsessed with exercise and eating, but she does rapidly lose the weight.