This article came up a Google alert of mine:
Dr. Collins: Watch out for exercise-induced food allergies
We have all heard that statement, "You are what you eat." For some athletes, it should be "You are as fast as you eat."
Food allergies are often difficult to investigate and identify. In athletes, there can be an even more complex syndrome where they tolerate a particular food in their daily life, but have an allergic reaction if they consume that food in conjunction with intense exercise.
Read More Here.