How does belly fat affect the liver?

Q: How does belly fat affect the liver?

Krishna: Belly fat—specifically deep visceral fat surrounding internal organs—releases a constant flow of free fatty acids and inflammatory signals directly into the liver via the portal vein. This overload triggers fat accumulation, insulin resistance, and chronic inflammation, which can progress to metabolic dysfunction-associated steatotic liver disease (MASLD)

How Visceral Fat Damages the Liver

Direct fatty acid flow: Visceral fat drains straight into the portal vein, flooding the liver with excess lipids that turn liver cells into storage units. Insulin resistance: Toxic chemicals and hormones from belly fat block normal insulin function, forcing the pancreas to produce more insulin and trapping more fat inside the liver. Chronic inflammation: Active fat tissue releases harmful proteins (cytokines) that inflame liver cells, raising the risk of severe tissue scarring, fibrosis, or cirrhosis.

Excess visceral fat (VAT) causes the free flow of fatty acid and de novo lipid synthesis result in steatohepatitis. Visceral fat is a key mediator of inflammation in NAFLD leading to NASH. Constant release of pro-inflammatory molecules and high-fat content from VAT causes the hepatic insulin resistanceresulting in NAFLD. High-fat content alters the mTOR pathway enhancing lipid biosynthesis and decreasing autophagy in NAFLD. (1)

Image credit: Fatty Liver Foundation

Fatty liver is when there's too much fat in your liver. Your liver is the body's main organ for processing food and waste materials. A healthy liver contains very little or no fat. If you drink too much alcohol, or eat too much food, your body turns some of the calories into fat. This fat is stored in your liver cells. You have fatty liver when fat makes up more than 5% of the total weight of your liver. Over time fatty liver can lead to cirrhosis (scarring).

It is when too much fat has built up in your liver, it can lead to liver damage. In most people liver damage can be reversed. You can prevent or improve this condition with a healthy lifestyle that includes lowering your alcohol intake.

The most common causes of fatty liver are: being overweight or obese especially around the abdomen (tummy), having type 2 diabetes or insulin resistance, having high blood fats — cholesterol or high triglycerides, drinking too much alcohol

Less common causes of fatty liver are: an underactive thyroid, some medicines,having polycystic ovary syndrome (PCOS) If the cause is belly fat, you should take steps to reduce it.

Footnotes:

1. https://www.sciencedirect.com/science/article/pii/S2666149723000270