Who is Gina Lucarelli from Wasted: A Memoir of Anorexia and Bulimia and what is their importance?

Gina Lucarelli is a young friend with whom Marya argues about food and dieting. Gina is disappointed that there is nothing but low fat and healthy food in Marya's house. Marya tells Gina she is on a diet. She purposefully tells Gina that Gina's mother is fat in an attempt to hurt Gina's feelings.