Hyperlipidemia (Type III Hyperlipoproteinemia/Familial Dysbetalipoproteinemia)
What is Hyperlipidemia (Type III Hyperlipoproteinemia/Familial Dysbetalipoproteinemia)?
Type III hyperlipoproteinemia is a rare genetic condition that causes both cholesterol and triglycerides to build up in your blood. This happens when your body cannot clear certain fat particles called remnant lipoproteins. These remnants are leftover pieces from cholesterol and triglyceride transport through your bloodstream.
The condition requires a specific genetic variant called ApoE2/E2. The ApoE gene tells your body how to make a protein that helps remove fats from your blood. People with two copies of the E2 variant have reduced ability to clear these fat remnants. However, genetics alone is not enough. Most people with the ApoE2/E2 genotype only develop symptoms when combined with other factors like obesity, diabetes, or hypothyroidism.
Type III hyperlipoproteinemia affects roughly 1 in 5,000 people. It can cause yellow fatty deposits under your skin and significantly raises your risk of heart disease and stroke. The good news is that once diagnosed, this condition often responds very well to treatment.
Symptoms
- Yellow or orange fatty deposits on elbows, knees, hands, feet, or buttocks, called xanthomas
- Yellow creases in the palms of your hands, called palmar xanthomas
- Fatty deposits around your eyes, called xanthelasmas
- Chest pain or angina from blocked arteries
- Pain in your legs when walking, called claudication
- Early heart disease or heart attacks, often before age 50
- Stroke or mini-stroke symptoms
- Pancreatitis with severe abdominal pain when triglycerides are very high
Many people have no symptoms until they develop heart disease or get routine blood work. The characteristic yellow skin deposits may not appear until later in life.
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Causes and risk factors
Type III hyperlipoproteinemia requires the ApoE2/E2 genotype, which you inherit from both parents. The ApoE2 protein has weaker binding to receptors that clear fat particles from your blood. This genetic variant alone is necessary but not sufficient. Additional triggers activate the condition, including obesity, type 2 diabetes, hypothyroidism, kidney disease, menopause in women, and excessive alcohol use.
Risk factors include family history of early heart disease, unexplained high cholesterol and triglycerides that rise together, and ancestry from certain populations where ApoE2 is more common. Lifestyle factors like a high-fat diet, lack of exercise, and weight gain can unmask the genetic predisposition. Men typically develop symptoms in their 20s to 40s, while women often develop symptoms after menopause when estrogen levels drop.
How it's diagnosed
Doctors diagnose Type III hyperlipoproteinemia through blood tests that show both high cholesterol and high triglycerides with roughly equal elevation. The ratio of total cholesterol to triglycerides is often close to 1. Specialized lab testing can reveal a broad-beta band on lipoprotein electrophoresis, which is characteristic of remnant particles. Genetic testing for the Apolipoprotein E genotype confirms the diagnosis by identifying the ApoE2/E2 variant.
Rite Aid offers ApoE genotype testing as an add-on to help identify your genetic risk for this condition. Your doctor may also check for secondary causes like thyroid function, blood sugar, and kidney health. Early diagnosis is important because Type III hyperlipoproteinemia responds well to treatment and lifestyle changes.
Treatment options
- Weight loss of even 5 to 10 pounds can significantly improve lipid levels
- Low-fat diet limiting saturated fats and avoiding simple carbohydrates
- Regular aerobic exercise for at least 30 minutes most days of the week
- Limit or avoid alcohol, which worsens triglyceride levels
- Fibrate medications like fenofibrate or gemfibrozil to lower triglycerides
- Statin medications to reduce cholesterol production
- Treating underlying conditions like diabetes or hypothyroidism
- Hormone replacement therapy may help women after menopause
- Regular monitoring with blood tests to track lipid levels
- Cardiovascular risk assessment and prevention strategies
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- Simple blood draw at your nearest lab
- Results in days, not weeks
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Frequently asked questions
Type III hyperlipoproteinemia causes both cholesterol and triglycerides to rise together, usually in roughly equal amounts. Other forms of high cholesterol typically affect only cholesterol or only triglycerides. Type III is genetic and requires the ApoE2/E2 variant, while most high cholesterol is related to diet and lifestyle. It also causes distinctive yellow skin deposits and responds differently to medications.
Type III hyperlipoproteinemia affects about 1 in 5,000 people. The ApoE2/E2 genotype is more common, occurring in about 1 in 100 people. However, only a small fraction of people with this genotype develop the full condition. Additional factors like obesity, diabetes, or thyroid disease are needed to trigger symptoms.
Yes, many people have no symptoms until they develop heart disease or have routine blood work. The yellow skin deposits may not appear for years. You might only discover the condition through blood tests showing high cholesterol and triglycerides together. This is why screening is important, especially if you have a family history of early heart disease.
The ApoE genotype test identifies which versions of the ApoE gene you inherited. Everyone has two copies, which can be E2, E3, or E4. The E2/E2 combination is required for Type III hyperlipoproteinemia. The test also provides information about Alzheimer's disease risk, as the E4 variant increases risk while E2 may be protective.
If you have Type III hyperlipoproteinemia, you have two copies of the ApoE2 variant. You will pass one E2 variant to each child. Whether they develop the condition depends on what variant they inherit from the other parent and whether they encounter triggering factors. Genetic counseling can help you understand the specific risks for your family.
Type III hyperlipoproteinemia often responds very well to treatment. Many people see significant improvement within weeks to months of starting medication and lifestyle changes. Fibrate medications are particularly effective for this type. Weight loss of even 5 to 10 pounds can make a big difference in your cholesterol and triglyceride levels.
A low-fat diet is important, especially limiting saturated fats from meat and dairy. Avoid simple sugars and refined carbohydrates, which raise triglycerides. Focus on vegetables, lean proteins, whole grains, and healthy fats from fish and nuts. Alcohol can worsen triglycerides, so limit or avoid it completely.
Palmar xanthomas are yellow or orange streaks in the creases of your palms. They occur when remnant lipoproteins deposit in your skin. These deposits are characteristic of Type III hyperlipoproteinemia and rarely occur in other conditions. They often fade or disappear when your lipid levels improve with treatment.
Your doctor will likely check your lipid levels every 3 to 6 months when starting treatment. Once your levels are stable, you may need testing every 6 to 12 months. Regular monitoring helps ensure your treatment is working and allows for adjustments. You may also need periodic tests for liver function if taking certain medications.
Some people with mild cases may control their lipid levels through weight loss, diet, and exercise alone. However, most people need medication in addition to lifestyle changes. The combination of fibrates or statins with healthy habits typically works best. Never stop medications without talking to your doctor, as untreated Type III hyperlipoproteinemia significantly raises heart disease risk.