DefinitionGalactosemia is a condition in which the body is unable to use (metabolize) the simple sugar galactose.Alternative NamesGalactose-1-phosphate uridyl transferase deficiency; Galactokinase deficiency; Galactose-6-phosphate epimerase deficiencyCauses, incidence, and risk factorsGalactosemia is an inherited disorder. This means it is passed down through families.It occurs in approximately 1 out of every 60,000 births among Caucasians. The rate is different for other groups.There are three forms of the disease:Galactose-1 phosphate uridyl transferase deficiency (classic galactosemia, the most common and most severe form)Deficiency of galactose kinaseDeficiency of galactose-6-phosphate epimerasePeople with galactosemia are unable to fully break down the simple sugar galactose. Galactos