Gail Saltz, M.D.

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Dr. Saltz says it's no wonder Jill is struggling with so much pain. "You've got your dad locked in this torturous dance of being cruel to each other and defiant. But you've got your mom off to the side sneaking away from dad. Your parents are divided. You have them each individually—and there's nothing more guilt inducing...I suspect that that is further fueling your eating; stuffing down the guilt."

Dr. Saltz says that Jill's dad needs to stop seeing his daughter as a narcissistic extension of himself, as if Jill's extra weight were his own. "It's not your body," she explains. "It's her body."