Introduction

Tangier disease is a rare inherited disorder caused by mutations in the ABCA1 gene, which is responsible for transporting cholesterol out of cells. When the ABCA1 gene is compromised, cholesterol and phospholipid transport is disrupted, leading to a buildup within cells and low levels of high-density lipoprotein (HDL) in the bloodstream, which can lead to cholesterol deposits in various locations in the body, which can cause heart disease, vision clouding, facial paralysis, enlargement of liver and spleen, diabetes and anaemia.¹ 

Dietary management is a crucial step in reducing fat buildup and promoting overall health. A diet low in fat and rich in essential nutrients can help manage symptoms and prevent further complications. Certain supplements that support heart and nerve health can also address deficiencies caused by Tangier disease. 

This article explores the role of a low-fat diet along with targeted supplements to manage Tangier disease to help you lead a healthier life.

Understanding Tangier disease

Tangier disease is an autosomal recessive disorder, and a person must inherit two faulty copies of the ABCA1 gene – one from each parent – to develop the disease. If only one mutated copy is inherited, the person is a carrier and may have lower-than-normal high-density lipoprotein (HDL) levels but typically does not experience severe symptoms. However, if a person inherits two mutated copies, one from each parent, they will develop the full effects of Tangier disease, leading to significant health complications.²

People have 46 chromosomes, one set (23) of chromosomes from each parent. Within the chromosomes are our genes, which act like instruction manuals for a specific trait, such as eye colour, hair colour, and even how your body processes cholesterol. Since we get our genetic material from both parents, we have two copies of each gene, which are called alleles.³

Mutations in genes are similar to having some mistakes in an ‘instruction manual’. The ABCA1 gene provides instructions for a protein synthesis that helps move cholesterol out of cells, serving vital functions. Mutations in this gene would prevent the production of a normal, functional protein, which causes Tangier disease. As a result, cholesterol builds up inside cells instead of being transported out. This leads to the accumulation of cholesterol in various tissues, such as the tonsils and spleen, causing them to enlarge and turn orange – a distinctive feature of the disease. Over time, this buildup contributes to nerve damage, organ enlargement, and an increased risk of cardiovascular disease.²

Symptoms

If you present both mutated alleles, you may be affected by Tangier disease and experience the symptoms mentioned below:²

• Abdominal pain
• Chronic enlarged lymph nodes without infection
• Enlargement of the liver, spleen, tonsils, heart and brain
• Dry skin
• Abnormal nail shape, colour, or texture
• Weakness of facial muscles
• Yellow or orange tonsils

Health risks

Tangier disease presents a range of health risks due to the body’s inability to handle cholesterol including:²

• Cardiovascular disease: The lack of HDL leads to cholesterol buildup in artery walls, causing plaque formation or atherosclerosis, thus increasing the risk of coronary artery disease, heart attack and strokes. In some cases, cholesterol deposits can affect the functioning of heart valves
• Peripheral neuropathy: Cholesterol accumulation in nerve cells can cause nerve damage, leading to loss of sensation of pain and temperature, muscle weakness, facial muscle weakness or paralysis, and numbness or tingling of hands and feet
• Enlarged and coloured tonsils: This occurs due to cholesterol deposits, leading to breathing and swallowing difficulties
• Enlarged spleen: This occurs due to cholesterol deposits, which can increase the risk of spleen rupturing, causing critical internal bleeding
• Corneal opacity: Cholesterol accumulation in the cornea can cause vision clouding
• Increased risk of diabetes: Cholesterol deposits within the pancreas can lead to diabetes in people affected by Tangier disease

Why does diet matter in Tangier disease?

Excessive fat intake while your cells are unable to remove the cholesterol can worsen its accumulation in tissues, increasing the risk of complications like nerve damage, organ enlargement, and cardiovascular disease.

A low-fat diet minimises the cholesterol buildup and reduces the strain on the body's lipid metabolism. Essential nutrient supplementation, such as omega-3 fatty acids and antioxidants can support heart health and reduce inflammation. Healthy diets slow down disease progression and improve well-being.⁴

Low-fat diet, a key strategy

Low-fat diets consist highly of foods that have less than 30% of calories deriving from fat. It limits the intake of total fat, especially saturated and trans fats, and focuses on lean proteins, whole grains, fruits, and vegetables.⁴

Since Tangier disease impairs cholesterol transport, low-fat diets help prevent excess cholesterol buildup in tissues, reducing the risk of complications. Here is a guide on what to eat and what to limit.

Recommended foods that are nutrient-dense and heart-friendly:⁴

• Lean proteins: Chicken, turkey, fish (especially fatty fish rich in omega-3s), tofu, and legumes provide essential protein without excessive unhealthy fats
• Fruits and vegetables: Rich in antioxidants and fiber, these help lower inflammation and support healthy digestion
• Whole grains: Brown rice, oats, quinoa, and whole wheat products provide sustained energy and aid cholesterol metabolism
• Healthy fats: Avocados, nuts, seeds, and olive oil supply beneficial unsaturated fats, which promote heart health 

Foods to avoid to reduce cholesterol accumulation:⁴ 

• High-fat dairy: Butter, cream, full-fat cheese, and whole milk are high in saturated fats, which can worsen cholesterol buildup
• Fried and processed foods: These often contain trans fats and excessive salt, which negatively impact heart health
• Fatty cuts of meat: Red meats and processed meats (like bacon and sausages) contain high levels of saturated fats
• Sugary and refined foods: Excess sugar and refined carbohydrates can disrupt lipid metabolism, making cholesterol management more difficult 

Role of supplementation in Tangier disease

Since Tangier disease affects cholesterol metabolism and overall lipid balance, supplementation can help support heart health, nerve function, and cellular protection. While a balanced diet is key, certain nutrients may need to be supplemented to prevent complications and improve quality of life.

• Omega-3 fatty acids help reduce inflammation, support heart health, and protect nerve function and can be found in fish oil, flaxseeds, walnuts, and chia seeds⁵
• Vitamin E and antioxidants act as cellular protectors, preventing oxidative damage that can worsen cholesterol-related complications and are naturally present in nuts, seeds, avocados, and leafy greens⁶
• B vitamins (B12, B6, folate) are essential for nerve function and red blood cell production, which can be affected in Tangier disease and are present in eggs, dairy, fish, poultry, and fortified cereals⁷

Some individuals with Tangier disease may need specialised medical supplements if dietary intake is insufficient. Since improper supplementation can have unintended effects, consulting a doctor before starting any supplements is a must. A healthcare provider can determine the adequate dosage and ensure that supplements do not interfere with other aspects of disease management.

Summary

Tangier disease is a rare genetic disorder caused by mutations in the ABCA1 gene, leading to cholesterol buildup in cells and low HDL levels. This results in complications such as cardiovascular disease, nerve damage, organ enlargement, and diabetes.

A low-fat diet is essential to prevent cholesterol accumulation. Recommended foods include lean proteins, fruits, vegetables, whole grains, and healthy fats, while high-fat dairy, fried foods, processed meats, and refined sugars should be avoided.

Supplementation with omega-3 fatty acids, vitamin E, and B vitamins may help support heart and nerve health, but medical consultation is necessary before starting any supplements. Proper dietary management and supplementation can help reduce complications and improve overall health.