The first trace of information that was brought to light about galactosemia was in 1908 by Von Ruess. He composed an article of his findings in an infant with many of the symptoms we now relate to galactosemia. This work has widely been accepted by scientists as the first reported case of galactosemia. However, at this time the diagnosis of galactosemia was not yet possible. It would be nine years before a similar diagnosis of galactosuria was largely accepted by scientists as a hereditary disorder. In 1917, galactosuria was treated by eliminating dairy products from an individual's diet. ("galactosemia") The discovery of galactosemia was published by Manson and Turner in immense detail. Although this disease was recognized earlier, it was not until 1956 that scientists discovered the mutated gene that causes galactosemia. It is know that the mutated gene is found encoded on chromosome 9. In 1963, a major break- through was unearthed. Galactosemia was the second disorder found to be detectable through newborn screening. Finally, in 1970 galactosemia was acknowledged as a metabolic disease. Today scientists largely accept the notion that galactosemia is a rare metabolic disorder (disease).
This disorder comes in two different variations.