Glucose/galactose malabsorption (GGM) is a rare autosomal recessive disorder caused by a defect in glucose and galactose transport across the intestinal brush border. Patients with GGM present with neonatal onset of severe life-threatening watery diarrhea and dehydration. If diagnosed and treated properly, patients can fully recover and show normal growth and development (summary by Xin and Wang, 2011).