When a doctor told Susan Levin her 4-year-old son, Ben, was autistic, she was shocked. "Oh my God. What are we going to do?" Levin recalls. "Everyone knew autism was a lifelong disorder and couldn't be cured." Except that in Ben's case, it could be. And it was. The family's journey ... is detailed in her new memoir, "Unlocked: A Family Emerging From the Shadows of Autism." Levin is part of a growing group of people who are paying more attention to diet " organic, gluten- and casein-free among them " as a way to treat the symptoms of autism and other disorders. Now 12, Ben is studying for his bar mitzvah. Eight years after that chilling diagnosis, he's become more empathetic, frequently saying "I love you" to his mother, his father and sister. Levin says his newfound compassion is nothing short of a miracle. While the scientific verdict is still out on diet as a cure, statistics point to a definite link between gastrointestinal issues and autism. A 2012 study published by the Journal of Abnormal Child Psychology found a direct link between GI issues and behavior. As many as 70 percent of children with autism have gastrointestinal issues at some point during childhood or adolescence. Kathleen DiChiara ... was diagnosed with sudden onset neuropathy, which left her unable to walk. When the doctors told her there was little to be done, she went back to school to study. She's now a nutrition educator, chef and speaker who credits an all-organic diet for healing not only herself, but her 11- year-old son, Steven, who'd been diagnosed as autistic but is no longer considered to be.