What Causes Fatty Liver Disease?

Fatty liver disease (hepatic steatosis) refers to a pathological condition characterized by excessive accumulation of fat within hepatocytes, resulting from various causes. It is a common hepatic pathological change rather than an independent disease. Below, we address the question: What causes fatty liver?

What Causes Fatty Liver?

Fatty liver results from excessive fat accumulation in the liver. It represents a relatively common pathological change among liver diseases, caused specifically by abnormal deposition of fat within hepatocytes. Normally, the liver contains only small amounts of fat—such as triglycerides and cholesterol—which collectively account for approximately 3–5% of total liver weight; at this level, fatty liver does not develop. However, when intrahepatic fat accumulation exceeds this threshold, leading to hepatocellular steatosis (fatty degeneration), fatty liver disease ensues.

Clinical manifestations of fatty liver vary depending on individual factors such as constitution, age, lifestyle habits, and timing of diagnosis. In mild cases, patients may be entirely asymptomatic, with the condition often detected incidentally during routine health examinations. Moderate fatty liver may present with symptoms including anorexia, nausea, vomiting, and dull pain in the right upper quadrant (liver area). Severe cases may progress rapidly and manifest with complications such as ascites and severe electrolyte imbalances.

If diagnosed and treated early, fatty liver may fully resolve. Therefore, upon detection of fatty liver, prompt consultation at a reputable medical institution is essential. Comprehensive diagnostic evaluations should be performed to identify underlying etiologies and guide targeted therapy. Under physician supervision, hepatoprotective and lipid-lowering medications—such as lecithin or ursodeoxycholic acid—may be prescribed. Additionally, daily lifestyle modifications are crucial: adopt a low-fat, low-sugar diet; increase intake of vegetables (e.g., leafy greens); limit consumption of fatty meats and fried foods; ensure adequate dietary selenium intake; and engage regularly in aerobic physical activity—such as jogging or brisk walking—to enhance fat metabolism.

The above outlines the primary causes of fatty liver disease. We hope this information proves helpful to you.