This causes excess amounts of abnormal glycogen to be deposited in the liver, muscles, and, in some cases, the heart.

[medical citation needed] Glycogen storage disease type III presents during infancy with hypoglycemia and failure to thrive.

[2] In regards to genetics glycogen storage disease type III is inherited in an autosomal recessive pattern (which means both parents need to be a carrier), and occurs in about 1 of every 100,000 live births.

The highest incidence of glycogen storage disease type III is in the Faroe Islands where it occurs in 1 out of every 3,600 births, probably due to a founder effect.

[1] Clinical manifestations of glycogen storage disease type III are divided into four classes:[3] Treatment for glycogen storage disease type III may involve a high-protein diet, to facilitate gluconeogenesis.