'The Biggest Loser' Has Big Problems... - LiveScience.com
"...And indeed, things have. Two patients were hospitalized after collapsing during a one-mile (1.6 km) foot race for the season 8 premiere. This year's season 9 opened with another strenuous challenge in which contestants raced 26.2 miles (42 km) on stationary bikes. Show medical consultant and UCLA professor Rob Huizenga had to drag one protesting contestant off her bike when she was stricken with severe cramps. A second contestant, 526-pound Michael Ventrella, was treated for exhaustion.
...Risks aside, weight-loss experts say that the biggest problem with the Biggest Loser is that extreme methods of dropping pounds are less likely to work in the long run. Several former Biggest Loser contestants have regained some or all of the weight, which doesn't surprise Kushner."