Study of Nutritional Factors in Porphyria

PROTOCOL OUTLINE: Women record diet intake for at least 1 cycle (28 days), then undergo a comprehensive nutritional assessment at least once during the follicular and luteal phases of the cycle. Men also record diet intake for at least 1 month and undergo indirect calorimetry and other studies. All patients receive a comprehensive analysis of diet and energy metabolism. Energy expenditure, resting metabolic rates, and basal metabolic rates are determined with indirect calorimetry, including measurements taken during the follicular and luteal phases of the cycle. Other testing includes hormone assays, serology for nutritional studies, and a urinary metabolite profile. Zinc, lead, and other metals are measured by atomic absorption spectroscopy. The diagnosis of acute intermittent porphyria is confirmed by erythrocyte porphobilinogen deaminase; urinary aminolevulinic acid, porphobilinogen, and porphyrins; and total fecal porphyrins. Patients hospitalized for acute attacks of porphyria during the study will receive standard treatment, including intravenous hematin and parenteral support.