Celebrity Yo-Yo Dieters
Kirstie Alley, the ultimate yo-yo-er, just announced another turn in her diet saga: 50 pounds shed. For some celebs, including Britney Spears, Tyra Banks, and 11 others, the battle of the bulge never ends.
Gallery: Celebrity Yo-Yo Dieters
Xtra Insight: Plus: The pros and cons of seven popular crash diets.
Sarah Moga is a producer and writer based in New York City and Los Angeles.