Non-alcoholic fatty liver disease (NAFLD) is a common condition where excess fat is stored in the liver. It affects around 25% of the population and is often linked to obesity and diabetes.

While NAFLD itself does not usually cause symptoms, it can lead to serious complications such as liver scarring, liver failure, and liver cancer. However, what many people don’t realize is that NAFLD can also pose a risk to the heart.

What is NAFLD?

NAFLD is a condition where too much fat is stored in the liver cells. This can cause inflammation and damage to the liver, leading to scarring and even liver failure.

There are two types of NAFLD: simple fatty liver (also known as non-alcoholic fatty liver or NAFL), and non-alcoholic steatohepatitis (NASH).

Simple fatty liver (NAFL) is the most common form of NAFLD. It occurs when there is too much fat in the liver cells, but there is no inflammation or damage.

Simple fatty liver usually does not cause any symptoms and does not usually progress to more serious liver disease.

Non-alcoholic steatohepatitis (NASH) is a more serious form of NAFLD. It occurs when there is too much fat in the liver cells, but there is also inflammation and damage.

NASH can cause scarring or fibrosis in the liver, which can eventually lead to cirrhosis and liver failure.

How does NAFLD affect the heart?

NAFLD has been linked to an increased risk of cardiovascular disease (CVD), which is a group of conditions that affect the heart and blood vessels. CVD includes heart attacks, stroke, and peripheral artery disease.

In fact, people with NAFLD are twice as likely to develop CVD compared to people without NAFLD.

There are several ways that NAFLD can affect the heart:.

1. Insulin resistance

Insulin resistance is a common feature of both NAFLD and CVD. Insulin is a hormone that helps regulate blood sugar levels, but when the body becomes resistant to insulin, it can lead to high blood sugar levels and other metabolic problems.

Insulin resistance has been linked to an increased risk of CVD and can also contribute to the development of NAFLD.

2. Inflammation

Inflammation is a key feature of both NAFLD and CVD. In NAFLD, inflammation can lead to liver damage and scarring, while in CVD, inflammation can cause damage to the blood vessels.

Chronic, low-grade inflammation has been linked to an increased risk of CVD and is also a hallmark of obesity and metabolic syndrome, which are common risk factors for NAFLD.

3. Dyslipidemia

Dyslipidemia is a term used to describe an abnormal lipid profile, including high levels of LDL cholesterol (the “bad” cholesterol) and triglycerides, and low levels of HDL cholesterol (the “good” cholesterol).

Dyslipidemia is a common feature of both NAFLD and CVD and can contribute to the development of both conditions. High levels of triglycerides have been shown to be particularly important in the development of NAFLD and CVD.

4. Oxidative stress

Oxidative stress is a term used to describe the imbalance between free radicals (molecules with unpaired electrons) and antioxidants in the body. Free radicals can damage cells and tissues, leading to inflammation and other problems.

Oxidative stress has been implicated in the development of both NAFLD and CVD. In NAFLD, oxidative stress can lead to liver damage and scarring, while in CVD, oxidative stress can contribute to the development of atherosclerosis (hardening and narrowing of the arteries).

5. Endothelial dysfunction

The endothelium is the inner lining of the blood vessels. Endothelial dysfunction occurs when the endothelium does not function properly, leading to atherosclerosis and other problems.

Endothelial dysfunction is a common feature of both NAFLD and CVD and can contribute to the development of both conditions. NAFLD has been shown to be independently associated with endothelial dysfunction, even after adjusting for traditional risk factors for CVD.

Conclusion

Non-alcoholic fatty liver disease (NAFLD) is a common condition that can lead to serious liver problems, including liver scarring, liver failure, and liver cancer.

However, what many people don’t realize is that NAFLD can also pose a risk to the heart. People with NAFLD are twice as likely to develop cardiovascular disease (CVD) compared to people without NAFLD.

NAFLD can affect the heart in several ways, including through insulin resistance, inflammation, dyslipidemia, oxidative stress, and endothelial dysfunction. If you have NAFLD, it’s important to manage your risk factors for CVD, such as high blood pressure, high cholesterol, and diabetes, in order to reduce your risk for heart disease.