Julie Hadden, one of the most successful and memorable contestants from NBC's "The Biggest Loser," struggled with her self-worth--and her size--for years. At age 34, she found herself at a crossroads: would she settle for staying "big" for the rest of her life, or would she insist on making big changes instead. Reality-TV fans know which path Julie chose that day. When she stepped on the scale at the show's season-four finale, revealing that she had lost an astounding 45 percent of her body weight, she simultaneously stepped into the world's collective heart.