The Biggest Losers

Watch The Biggest Losers. Seriously, aren't we worried about those guys and gals dropping weights by kilos each week? More than 10 kgs in a week? I admire their determination and hard work to shed those number of kgs in short time frame...is it safe and healthy for them?? Will it damage their bodies irrevocably? Of course, staying obese isn't healthy but surely losing weight should be done gradually, not drastically. Welcome to the world where weakness is exploited for drama and wealth.