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Carbohydrate Metabolism Disorders
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Metabolic Problems

Carbohydrate Metabolism Disorders

Carbohydrate metabolism disorders are a group of inherited conditions where the body lacks the enzymes necessary to properly break down carbohydrates.

Overview

Metabolism is the process your body uses to make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system (enzymes) break the food parts down into sugars and acids, your body's fuel. Your body can use this fuel right away, or it can store the energy in your body tissues. If you have a metabolic disorder, something goes wrong with this process.

Causes and Diagnosis

Carbohydrate metabolism disorders are a group of metabolic disorders. Normally your enzymes break carbohydrates down into glucose (a type of sugar). If you have one of these disorders, you may not have enough enzymes to break down the carbohydrates. Or the enzymes may not work properly. This causes a harmful amount of sugar to build up in your body. That can lead to health problems, some of which can be serious. Some of the disorders are fatal.

These disorders are inherited. Newborn babies get screened for many of them, using blood tests. If there is a family history of one of these disorders, parents can get genetic testing to see whether they carry the gene. Other genetic tests can tell whether the fetus has the disorder or carries the gene for the disorder.

Treatment

Treatments may include special diets, supplements, and medicines. Some babies may also need additional treatments, if there are complications. For some disorders, there is no cure, but treatments may help with symptoms.

Frequently Asked Questions

The lab will repeat the confirmatory test (often a quantitative urine organic acid or plasma glucose/galactose assay) and may order enzyme activity studies. A metabolic specialist will meet with you to discuss treatment options, which usually start with a specific diet (e.g., lactose‑free or galactose‑restricted) and close monitoring of blood sugar. Early intervention dramatically improves prognosis.
Children with GSD‑I cannot release stored glucose effectively, so they need frequent, small meals rich in complex carbohydrates and avoid long fasting. Simple sugars (especially fructose, sucrose, and lactose) should be limited because they can cause rapid hypoglycemia. A dietitian will often prescribe uncooked cornstarch (or a modified starch) at bedtime to provide a slow‑release glucose source.
Watch for shakiness, sweating, irritability, headache, or seizures. If blood glucose is <70 mg/dL, give 15 g of fast‑acting carbohydrate (e.g., 4 oz of fruit juice, glucose gel, or 5‑6 glucose tablets). Re‑check in 15 minutes; if still low, repeat the dose. Once stable, provide a longer‑acting carbohydrate (e.g., a slice of bread or a small serving of rice) to prevent recurrence. If the child is unconscious or unable to swallow, call emergency services and administer glucagon if prescribed.
Yes. Most carbohydrate metabolism disorders are autosomal recessive, so both parents are typically carriers. Testing siblings can identify asymptomatic carriers or affected infants who need early dietary management. Carrier testing also helps with future family planning and informs prenatal diagnostic options.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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