Running a restaurant, Evan hears about every kind of allergy or affliction related to food. Wheat allergies and lactose intolerance are the most common. Dr. Michael Wilkes is a Professor of Medicine and Vice Dean for Medical Education at UC Davis. He's also the host of KCRW's A Second Opinion which you can hear on Sundays during Weekend Edition on KCRW. Dr. Wilkes lists the differences between intolerance and a true allergy.