What exactly causes fatty liver, and how does it start if you're not a heavy drinker?

Fatty liver (steatotic liver disease) occurs when excess fat builds up in liver cells, exceeding 5% of liver weight, impairing function over time. For non-drinkers, it's primarily metabolic dysfunction-associated steatotic liver disease (MASLD, formerly NAFLD), driven by insulin resistance rather than alcohol.

Primary Causes in Non-Drinkers

The liver stores excess energy as fat when calorie intake outpaces use, especially from refined carbs/fructose, saturated fats, and ultra-processed foods that spike triglycerides. Insulin resistance (from obesity, inactivity, or genetics) blocks fat breakdown, shunting it to the liver; abdominal fat worsens this via inflammation.

How It Starts: The Cascade

  1. Energy imbalance: High-sugar/fat diets increase de novo lipogenesis (liver makes fat from carbs).

  2. Insulin resistance: Cells ignore insulin, raising blood sugar/fat; liver overproduces glucose/fat.

  3. Fat accumulation: Triglycerides flood hepatocytes; mild steatosis (simple fatty liver) forms, often silent.

  4. Progression risk: 20-30% advance to inflammation (NASH), fibrosis, cirrhosis if unchecked.

Key Risk Factors (No Heavy Drinking Needed)

Factor How It Triggers 
Obesity (esp. visceral fat) Fat spillover to liver 
Type 2 diabetes/insulin resistance Impaired fat export 
Metabolic syndrome (high BP, lipids) Inflammation + fat storage 
Poor diet (fructose, processed foods) Direct liver fat synthesis 
Sedentary lifestyle Reduced fat burning 
Rapid weight changes/malnutrition Disrupted lipid metabolism 

Rarer: meds (steroids, tamoxifen), viruses (hep C), genetics (lipodystrophy). Indians face higher risk from carb-heavy diets and genetics.

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