Our first Face-off of 2010 will tape Friday afternoon right here in New York City at the Cooper Union’s historic Great Hall. Anchor Cynthia McFadden will moderate. The topic of debate: Is it okay to be fat? On one side will be Crystal Renn, model and author of “Hungry: A Young Model’s Story of Appetite, Ambition and Ultimate Embrace of Curves,” and Marianne Kirby, co—author of “Lessons from the Fat—Sphere.” They will advocate against constant dieting and argue you don’t have to be thin to be healthy. On the other side: MeMe Roth, president of the National Action Against Obesity and Kim Bensen, author of “Finally Thin.” They will advocate against an obese America and in favor of responsible dieting. This will be the fifth installment of our Face-off series, which so far has included (from the most recent all the way back to the original, with highlights): Born to Cheat? Does Satan Exist? America Addicted to Porn? Does God Exist? Obesity is a topic we cover regularly, from broader implications for the health care system and economy to personal stories like this recent profile about an overweight mother and son attempting to lose weight together at a camp.