Adverse reactions to foods may be in the formal of 'food allergy', food hypersensitivity 'and' food intolerance. Several factors including immunology, mucosal barrier of the gastrointestinal tract, genetic and exposure to allergen play an important role in the pathophysiology of food allergy. Food allergen is protein or glycoprotein or polypeptide with the molecular weight of more than 18,000 d…