[Acute eosinophilic pneumonia suggesting the involvement of health food].

A 25-year-old woman presenting with acute febrile illness, progressive dyspnea, and severe hypoxemia was admitted. Chest radiography and computed tomography (CT) showed diffuse ground-glass opacities in the bilateral lung fields. Initial examination revealed SpO2 to be 90%. Oxygen was administered at a gradually increasing rate from 3L/min to a maximum of 6 L/min during the course of the same night. The eosinophil count in bronchoalveolar lavage fluid (BALF) was 5.6%. A transbronchial lung biopsy revealed alveolar septal edema, fibrin-containing exudate in airspaces, and infiltration of eosinophils into the alveolar septa. Based on these findings, we diagnosed acute eosinophilic pneumonia. Corticosteroid therapy was administered, and the abnormal shadows disappeared. She had taken a health food (Mulberry Diet) for two weeks before admission. Although a drug-induced lymphocyte stimulation test for the health food was negative, we speculated that the acute eoshinophilic pneumonia was caused by health food.