A novel form of treatment resistance in anorexia nervosa.

Case Report A single woman, aged 19 years, was admitted as an emergency to the medical ward of our hospital for feeding and medical management of severe malnutrition, dehydration, and acute renal failure due to AN. Her admission height and weight were 172 cm and 37.7 kg (body mass index 12.7 kg/m). One year before admission, her weight had been 63.3 kg (body mass index 21.4 kg/m). Over the year, she had increased her exercise, decreased her food intake, and increased her use of laxatives. We estimated that her average daily food intake for the last 3 months was 300 to 500 kcal. During the week before admission, she experienced weakness, persistent light-headedness, and difficulty completing her usual activities of daily living.