Nasal allergies, food allergies and allergic asthma are all disorders of the immune system. Our immune system is supposed to keep us safe from harm by fighting off infection, cancer, and other invaders. Unfortunately, in allergic disease, the immune system misreads the cues and ends up stimulating a reaction -- or overreaction -- that actually results in us feeling worse than we did to begin with.

Experts have been noting over the past couple of decades that allergic disease is on the rise,...