Grapefruit juice may help with weight management for those who eat fatty diets.

Researchers at the University of California, Berkeley, found that mice fed a high-fat diet grained 18 percent less weight when they drank clarified, pulp-free grapefruit juice compared to mice that drank sweetened water, according to a news release.

Juice-drinking mice also had improved levels of glucose, insulin and triacylglyceral, a type of fat acid.

“I was surprised by the findings,” Andres Stahl, associate professor of nutritional sciences and toxicology and one of the researchers, said in the release. “We even re-checked the calibration of our glucose sensors, and we got the same results over and over again.”

But the results weren't as pronounced in mice on a low-fat diet.

Although those animals had a two-fold decrease in insulin levels, they had no significant change in weight or other metabolic variables.

This isn't the first time that grapefruit juice has been linked to decreased weight gain.

Decades ago, Hollywood touted the grapefruit juice diet for weight loss.

Stahl and fellow researcher Joseph Napoli say the results warrant further study of the health benefits of grapefruit juice.