That "Zero Sugar" Sweetener Is Giving You Fatty Liver

You switched to diet soda to be healthier. But the artificial sweetener in it, acesulfame-K, is now linked to non-alcoholic fatty liver disease (NAFLD).

What the Study Found

A 2026 study in the International Journal of Molecular Medicine found that acesulfame-K (also called Ace-K) induces fatty liver disease by disrupting a specific receptor in the liver called PPARα. The sweetener triggers fat accumulation in liver cells through a pathway involving hepatic PLCβ.

The researchers described acesulfame-K as both "foe and friend" to this receptor, meaning it interferes with the liver's normal fat-processing system in a complex and damaging way.

Ace-K Is in More Than You Think

Acesulfame-K is one of the most widely used artificial sweeteners in the world. It's in diet sodas, sugar-free gum, protein shakes, flavored water, "light" yogurts, and thousands of other products labeled "zero sugar" or "sugar-free." Check the label. If it says acesulfame potassium or Ace-K, that's it.

NAFLD already affects roughly 25% of adults worldwide. It can progress to liver scarring, liver failure, and liver cancer. And now there's evidence that a "healthy" sugar substitute is making it worse.

What You Can Do

Drink water. If you need flavor, add fruit or try unsweetened herbal tea. Skip the "zero sugar" marketing and read the actual ingredients. Your liver doesn't care about the calorie count on the front of the can.

Check out our non-toxic kitchen alternatives for cleaner drink and food options.

Also see glass food containers for safer alternatives.

Source: Lin PY, Xie JR, Qian TC, et al. (2026). Int J Mol Med.