What Is Galactosemia?

Galactosemia is a rare inherited metabolic disorder where the body is unable to break down galactose, a simple sugar found in milk and other dairy products. This condition occurs due to a deficiency of specific enzymes that normally process galactose into glucose for energy.

If left untreated, galactose can build up in the body and cause serious health problems.

Causes of Galactosemia

Galactosemia is caused by mutations in genes responsible for producing enzymes that break down galactose. There are three main types:

• Classic Galactosemia (Type I) – caused by a deficiency of the GALT enzyme (most severe and common form)
• Galactokinase Deficiency (Type II) – less severe, caused by GALK gene mutation
• Galactose Epimerase Deficiency (Type III) – very rare, caused by GALE gene mutation

All types are inherited in an autosomal recessive pattern, meaning a child must inherit one defective gene from each parent.

Symptoms of Galactosemia

Symptoms often appear shortly after birth, especially after feeding with milk or formula. Common signs include:

• Poor feeding or sucking
• Vomiting
• Jaundice (yellowing of the skin and eyes)
• Diarrhea
• Irritability
• Failure to gain weight
• Enlarged liver
• Lethargy or excessive sleepiness
• Seizures

If not treated promptly, galactosemia can lead to liver damage, brain damage, cataracts, and even death in infants.

How Is Galactosemia Diagnosed?

Diagnosis usually happens in newborns through routine screening tests. Additional testing may include:

• Blood tests to measure galactose levels and enzyme activity
• Urine tests to detect abnormal substances
• Genetic testing to confirm the specific mutation

Early diagnosis is critical to prevent complications.

Treatment for Galactosemia

There is no cure, but galactosemia can be managed by strictly avoiding galactose in the diet.

Dietary Management:

• Eliminate all milk and dairy products (including breast milk)
• Avoid foods containing lactose (lactose = glucose + galactose)
• Use galactose-free formulas for infants (e.g., soy-based formula)
• Monitor food labels for hidden sources of galactose or lactose

Ongoing Care:

• Regular follow-up with a metabolic specialist
• Developmental assessments
• Speech and occupational therapy if needed
• Monitoring for long-term complications

Possible Complications

Even with proper treatment, some individuals may develop:

• Speech delays or learning difficulties
• Developmental delays
• Ovarian failure in females
• Bone density problems
• Increased risk of infections

Can Galactosemia Be Prevented?

Since galactosemia is genetic, it cannot be prevented, but it can be detected early through newborn screening. Parents with a family history of the disorder may consider genetic counseling before having children.

Living With Galactosemia

With early diagnosis and lifelong dietary management, many people with galactosemia can live healthy, productive lives. It’s important to stay informed, follow dietary restrictions strictly, and maintain regular medical care to monitor for any complications.