As far back as Ilana Muhlstein can remember she struggled mightily with her weight. As a morbidly obese child whose weight was the center of her family’s focus, she took comfort in sitting on a stool in front of the tv mindlessly eating to stuff down feelings about her chaotic family life and her parents’ multiple break-ups and reunions. “My stability,” Ilana tells me, “Became my stool in front of the television inside the kitchen with the...