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A second contestant, 526-pound Michael Ventrella, was treated for exhaustion.
Health risks of obesity The show's producers point out that contestants are under medical supervision and say the extreme nature of the competition is inspirational for viewers.
Best known for online survey and two public meetings held in late may on the night of the week ranging.
In the past seasons, the weight-loss reality show has repeatedly set new benchmarks for heaviest contestant (454, 476 and 526 pounds), fastest 100-pound weight loss (seven weeks), and most weight lost in one week (34 pounds).
The show, which takes obese Americans and pits them against each other in a battle to lose the most weight and win 0,000, thrives on extreme numbers.
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.