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Ricki Lake

Weight played a key role in the actress’s big break in 1988’s Hairspray, where she portrayed chubby Tracy Turnblad.

But Lake, now 42, struggled throughout the next 20 years, losing an extreme 100 pounds in 1992 by "starving" herself, she said. However, after limiting calories more responsibly and joining a fresh-food delivery service, she shed 140 pounds and maintains a healthy size 6.

Next: Randy Jackson