By Robert Bazell, NBC News Chief science correspondent
Tonight we begin a series on allergies which have been on a sharp increase in the United States and many other parts of the world in recent decades, especially among children. In tomorrow's report we will look at the possible reasons for the rise. Wednesday's segment will focus on food allergies. Today we speak with Dr. Michael Rich of Children's Hospital in Boston and Harvard who began his career as a film maker and brought those skills to his medical care.