1. A deficiency of any or all sugars in an organ or tissue.
2. A deficiency of sugar in the blood or tissues.

Glycopenia may be caused by the administration of too much insulin, excessive secretion of insulin by the islet sells of the pancreas, or the result of a dietary deficiency.

This condition can cause weakness, headache, hunger, visual disturbances, ataxia, anxiety, personality changes, and, if untreated, delirium, coma, and even death.