Fructose causes chemical changes (acetylation) on key fat-burning proteins in liver cells, making them less active — like putting grease on a gear so it doesn’t turn properly.

Fructose turns down the liver’s main switch (PPARα) that tells the body to burn fat, and it also reduces the level of a critical enzyme (CPT1α) needed to get fat into the mitochondria to be burned.

Eating too much fructose—like the sugar in soda and sweetened snacks—may slow down your liver’s ability to burn fat, which can lead to fat buildup and make your body less responsive to insulin.

Eating too much fructose—like the sugar in soda and candy—can slow down your liver’s ability to burn fat, making fat build up and mess up your metabolism.

When your liver processes fructose (a sugar found in fruit and soda), it burns through energy really fast, makes a waste product called uric acid, and this can damage the liver’s power plants and cause fat to build up—even if your insulin levels are normal.

When people eat a lot of fructose (like in sugary drinks), their liver has a harder time burning fat for energy, especially if they're also eating a lot of fat — which can lead to fat building up in the liver.