One of the most common and frequently misdiagnosed eosinophilic gastrointestinal diseases is eosinophilic esophagitis. When should a physician suspect eosinophilic esophagitis, and how can it be accurately diagnosed? How significant a factor is diet in such disorders? Dr. Jonathan Spergel, associate professor of pediatrics at the University of Pennsylvania School of Medicine, delves into the potential causes of eosinophilic gastrointestinal diseases with host Dr. Todd Mahr.