Does The Biggest Loser have big problems?

Are contestants on "The Biggest Loser" pushed too hard, too soon? A new report on LiveScience says some physicians and nutritionists think so. They worry that the show's focus on competitive weight loss could be dangerous, and that losing so much weight so quickly can be risky. In the article, the show's producers say contestants are under medical supervision and that the extreme nature of the competition is inspirational for viewers.

What do you think?

Also see:
Ali Vincent: Before, during, and after The Biggest Loser
Weight loss success stories - see how they did it
Obesity per state - where does yours rank?