People with obesity or diabetes who consume 20% or more of their daily calories from fast food have severely elevated levels of fat in their livers, according to a study from Keck Medicine of USC. The findings confirm a correlation between eating fast food and an increased risk of nonalcoholic fatty liver disease, a potentially life-threatening condition in which fat builds up in the liver.

While previous research has shown a link between fast food and obesity and diabetes, this is one of the first studies to demonstrate the negative impact of fast food on liver health.

The research was published in Clinical Gastroenterology and Hepatology.

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