An 8-month-old boy arrived at a Canadian allergy clinic carrying a long list of suspects: milk, soy, peanut, wheat, and egg. His parents had watched his face turn red within seconds of feeding, again and again. Several emergency department visits had hardened the fear that something in his diet was dangerous, and his menu kept shrinking.
The cause had nothing to do with his immune system. It was a nerve on the right side of his face that had rewired itself to the wrong destination.
