An antihistamine diet is recommended for patients with an abnormal reaction to histamine and involves the elimination of foods rich in histamine and those that trigger its release in the body. Such foods include certain fish, ripened cheeses, cured meats, alcohol and some fruit and vegetables. The latest guidelines from the German Society of Allergology and Clinical Immunology suggest a three-step antihistamine diet regimen: quieting symptoms by eliminating certain products (10-14 days), gradually introducing histamine foods (6 weeks) and determining the optimal diet for the patient. If the diet does not work, further diagnosis and, if necessary, the implementation of appropriate pharmacotherapy is recommended.