GAA and disorder of glycogen metabolism: Such defects can be classified into glycogen storage diseases (Glycogenosis), fatty acid oxidation defects such as Very-Long-Chain Acetyl-CoA Dehydrogenase Deficiency, Myoadenylate Deaminase Deficiency (MADAD), Systemic Carnitine Deficiency (SCD), and Lysosomal Glycogen Storage with Normal Acid Maltase Activity, and mitochondrial disorders due to respiratory chain impairment (Mitochondriopathies).