Why sugar and fat together make your liver fat
Fructose Impairs Fat Oxidation: Implications for the Mechanism of Western diet-induced NAFLD.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Fructose alone doesn’t always cause weight gain, but it still causes fatty liver — even in isocaloric conditions.
Common belief: sugar makes you fat because it adds calories. This study says sugar poisons fat metabolism even when calories are equal.
Practical Takeaways
Avoid combining sugary drinks or desserts with fried foods, pizza, or cheese-heavy meals — break the sugar-fat combo.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Fructose alone doesn’t always cause weight gain, but it still causes fatty liver — even in isocaloric conditions.
Common belief: sugar makes you fat because it adds calories. This study says sugar poisons fat metabolism even when calories are equal.
Practical Takeaways
Avoid combining sugary drinks or desserts with fried foods, pizza, or cheese-heavy meals — break the sugar-fat combo.
Publication
Journal
The Journal of nutritional biochemistry
Year
2022
Authors
Mustafa Kutlu Inci, Se-hyung Park, Robert N. Helsley, S. Attia, S. Softic
Related Content
Claims (4)
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.
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 a lot of fat and a lot of sugar together is worse for your liver than eating just fat or just sugar — they team up to cause more damage.