When animals eat fructose, their liver breaks it down super fast without needing insulin, turning it mostly into glucose and lactate — and this might mess with the liver's energy and lead to health problems if it happens too much.

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 animals eat a lot of sugar like fructose, especially along with high blood sugar, their liver makes more of a substance called lactate. This could sometimes build up and cause a problem called lactate acidosis, especially in people with diabetes or liver issues.

Eating a lot of fructose (like in sugary drinks) might turn up the activity of certain liver enzymes that process sugar and make fat, especially in people who already have metabolic problems like obesity or diabetes.

Eating too much fructose, like from sugary drinks, makes your liver turn it into fat, which can build up and lead to fatty liver disease—even if you don't drink alcohol.

When you drink sugary sodas or eat lots of fructose (like in high-fructose corn syrup), your liver might turn it into fat and make you more resistant to insulin — but this usually only happens with lots of it in liquid form, not from normal amounts in fruit or food.