It's a fad that's all the rage among celebrities: losing lots of weight, seemingly overnight.
Valerie Bertinelli and Kirstie Alley each endorsed weight-loss plans and famously flaunted their bikini-ready bodies, though Alley is again battling weight issues. And celebrity magazines have ruthlessly chronicled the ups and downs of stars such as Jessica Simpson and Jennifer Love Hewitt.
But while yo-yo dieting is appealing to many, it's being sworn off by some Americans like Marianne Kirby. She...Full Story