TOPICS: Glucose-6-phosphatase (G6PD) deficiency, Von Gierke disease (type I), Pompe disease (type II), Cori disease (type III), McArdle disease (type V), glucose, glucose 6-phosphate, severe fasting hypoglycemia, lactic acidosis, periodic acid-Schiff (PAS) stains, glycogen buildup, liver biopsy, glycogen buildup in liver, triglycerides, hyperuricemia, gluconeogenesis, fructose, galactose, debranching enzyme deficiency (Cori disease), alpha 1,4 linkage, alpha 1,6 linkage, liver, ketoacidosis, positive periodic acid-Schiff stains