Non-Alcoholic Fatty Liver Disease (NAFLD)
What is Non-Alcoholic Fatty Liver Disease (NAFLD)?
Non-Alcoholic Fatty Liver Disease happens when fat builds up in your liver. This occurs even if you drink little or no alcohol. The liver normally contains some fat. But when more than 5% of your liver is fat, it becomes a problem.
NAFLD is the most common liver condition in the United States. It affects about 25% of adults worldwide. Many people with NAFLD have no symptoms for years. The condition can range from simple fatty liver to a more serious form called non-alcoholic steatohepatitis, or NASH. NASH involves inflammation and liver cell damage along with the fat buildup.
Left unchecked, NAFLD can progress to liver scarring, called fibrosis, and eventually cirrhosis. The good news is that early detection and lifestyle changes can reverse fatty liver in many cases. Blood tests can catch warning signs before serious damage occurs.
Symptoms
- Fatigue and weakness that doesn't improve with rest
- Discomfort or dull ache in the upper right abdomen
- Unexplained weight loss in later stages
- Yellowing of the skin and eyes, called jaundice, in advanced cases
- Swelling in the abdomen or legs when cirrhosis develops
- Confusion or difficulty concentrating in severe cases
Most people with NAFLD have no symptoms in the early stages. The condition is often discovered during routine blood tests or imaging done for other reasons. This is why regular blood testing is so important for catching liver problems early.
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Causes and risk factors
NAFLD develops when your liver has trouble breaking down fats. This causes fat to build up in liver cells. Insulin resistance is the main driver of this process. When cells don't respond well to insulin, the liver produces more fat and has trouble removing it. Metabolic syndrome, which includes high blood sugar, excess belly fat, high blood pressure, and abnormal cholesterol, strongly raises your risk. Type 2 diabetes and obesity are major risk factors. Low Sex Hormone Binding Globulin levels are strongly linked to NAFLD because liver fat buildup suppresses SHBG production.
Other risk factors include rapid weight loss, certain medications, polycystic ovary syndrome, sleep apnea, and underactive thyroid. Genetics also play a role. Some people are more prone to storing fat in their liver. Poor diet, especially one high in refined carbohydrates and sugar, contributes to fat accumulation. A sedentary lifestyle makes insulin resistance worse. Age over 50 increases risk, though NAFLD is becoming more common in younger people and even children.
How it's diagnosed
NAFLD is typically diagnosed through a combination of blood tests, imaging, and medical history. Blood tests that measure liver enzymes are the first step. Alanine Aminotransferase, or ALT, is the primary screening biomarker for NAFLD. It often rises 2 to 5 times above normal when liver cells are damaged by fat buildup. Aspartate Aminotransferase, or AST, also rises but usually less than ALT in early NAFLD. Gamma-Glutamyl Transferase, or GGT, may be elevated as well. Low Sex Hormone Binding Globulin, or SHBG, is strongly associated with liver fat accumulation and can signal NAFLD severity.
Rite Aid tests include all these key biomarkers to help detect and monitor liver health. After abnormal blood tests, your doctor may order an ultrasound, CT scan, or MRI to visualize fat in the liver. In some cases, a liver biopsy is needed to determine the extent of inflammation and scarring. Regular blood testing helps track liver enzyme changes over time and assess whether lifestyle changes are working.
Treatment options
- Lose 7% to 10% of body weight through diet and exercise to reduce liver fat
- Follow a Mediterranean-style diet rich in vegetables, fruits, whole grains, and healthy fats
- Reduce sugar and refined carbohydrates, which drive insulin resistance and fat storage
- Exercise for at least 150 minutes per week, combining cardio and resistance training
- Control blood sugar if you have diabetes or prediabetes
- Manage cholesterol and triglyceride levels through diet and medication if needed
- Avoid alcohol completely, as it can worsen liver damage
- Work with your doctor on medications like metformin, pioglitazone, or vitamin E in some cases
- Treat underlying conditions like sleep apnea, thyroid problems, or PCOS
- Monitor liver enzymes regularly with blood tests to track progress
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- Results in days, not weeks
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Frequently asked questions
NAFLD is the umbrella term for fat buildup in the liver without heavy alcohol use. NASH is a more serious form where inflammation and liver cell damage occur along with the fat. NASH can progress to scarring and cirrhosis. Blood tests and sometimes liver biopsy help distinguish between simple fatty liver and NASH.
Yes, early-stage NAFLD can often be reversed with lifestyle changes. Losing 7% to 10% of your body weight can significantly reduce liver fat. Regular exercise and a healthy diet improve insulin sensitivity and help the liver clear fat. The key is catching it early through blood testing before permanent scarring develops.
ALT is the primary screening test for NAFLD and often rises 2 to 5 times above normal. AST, GGT, and low SHBG levels also signal liver fat accumulation and damage. Regular testing of these liver enzymes helps catch NAFLD early and monitor progress during treatment.
In NAFLD, ALT is typically more elevated than AST, giving an ALT to AST ratio greater than 1. This pattern reflects fat-related liver cell damage. If the ratio reverses and AST becomes higher, it may signal progression to more advanced scarring or cirrhosis.
No, most people with NAFLD have no symptoms in the early stages. The condition is often discovered during routine blood tests when liver enzymes are elevated. Symptoms like fatigue and abdominal discomfort usually appear only in advanced cases. This makes regular testing essential for early detection.
Insulin resistance is the main driver of NAFLD. When cells don't respond well to insulin, the liver produces more fat and struggles to break it down. This leads to fat accumulation in liver cells. Improving insulin sensitivity through diet, exercise, and weight loss is the cornerstone of NAFLD treatment.
Low Sex Hormone Binding Globulin is strongly linked to NAFLD and liver inflammation. When fat builds up in the liver, it suppresses SHBG production. Lower SHBG levels can signal more severe liver fat accumulation and higher risk of fibrosis. Measuring SHBG helps assess NAFLD severity.
Limit sugar, especially from sodas and sweets, as it drives fat production in the liver. Reduce refined carbohydrates like white bread, pasta, and pastries. Avoid saturated fats from fried foods and processed meats. Cut out alcohol completely, even though NAFLD is not caused by drinking.
Most doctors recommend testing liver enzymes every 3 to 6 months when actively treating NAFLD. This helps track whether lifestyle changes are reducing liver inflammation. Once your enzymes normalize and stay stable, you may test less frequently. Regular monitoring catches any progression early.
Yes, about 7% to 20% of people with NAFLD are lean or normal weight. Genetics, insulin resistance, and metabolic factors can cause liver fat buildup even without obesity. Lean NAFLD may be harder to detect because people without weight problems are less likely to get screened.