Face-Off: Is It OK to Be Fat?

Is it OK to be fat? Who gets to define what's fat? Have we become a dangerously supersized nation or is there an unhealthy obsession with being skinny? Such questions were tackled at the fifth "Nightline Face-Off." The debate was moderated by ABC News' Juju Chang Feb. 5 at the Cooper Union's historic Great Hall in New York City. (Heidi Gutman/ABC)