Inclusion Criteria:  Patients undergoing radiotherapy with or without concomitant chemotherapy for Ca nasopharynx, hypopharynx, palate, tonsils, mouth base, parotid, tongue, cervix and esophagus as well as mediastinal and lung cancer.  Exclusion Criteria:  Patients with psychiatric problems and inability to cooperate, as well as patients with gluten intolerance, as well as patients with hepatic encephalopathy or hyperammonemia are excluded from the study.