Forbes' disease is a glycogen storage disease that affects liver and muscle. It is characterized by the deposition of an abnormal glycogen structure and is caused by an amylo-1,6-glucosidase defect, the usual function of which is as a debranching enzyme.
Diagnosis is based on biochemical assay of leucocytes, liver or muscle.
Life expectancy is not affected significantly by this condition. Management is to avoid fasting - for example overnight infusions of calories and feed with uncooked corn starch, which releases calories slowly.
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