The role of hidden food allergy/intolerance in chronic disease.

A large body of medical literature has indicated that hidden food allergy is a frequent cause of a wide range of physical and mental conditions. Hidden allergies can be "unmasked" by means of an elimination diet, followed by individual food challenges. Although the concept of hidden food allergy remains controversial, the evidence strongly suggests that identification and avoidance of allergenic foods can relieve a number of common and difficult-to-treat medical problems.