This document summarizes several glycogen storage diseases caused by deficiencies in enzymes involved in glycogen synthesis and breakdown. Key points include: glycogen storage diseases are inherited disorders characterized by abnormal glycogen deposition; deficiencies in enzymes like glucose-6-phosphatase and acid maltase can cause hypoglycemia, lactic acidosis, hyperlipidemia, and other issues; the organs and severity of symptoms vary depending on the specific enzyme deficiency.