RESUMEN
We describe a 38-year-old, severely emaciated female with slowly progressive type 1 diabetes mellitus (SPIDDM), who had hypoglycemia due to fasting and an extremely low energy intake. After being diagnosed with diabetes mellitus (DM), she took in only 300-500 kcal per day and her weight had decreased to 30 kg, with a body mass index (BMI) of 11.4 kg/m<sup>2</sup>. She was admitted with hypoglycemia, and SPIDDM was confirmed by nearly-completely ceased insulin secretion and seropositivity towards anti-GAD antibody. After appropriate dietary therapy and insulin administration, she recovered from a state of emaciation and her glucose metabolism was restored. With this patient it proved very effective for the general physician to coordinate treatment for both diabetes and an eating disorder.