Low-fat milk (a.k.a. skim) used to be all the rage. But full-fat dairy is now back in favour—and for good reason. It’s less chemically processed than skim, so it’s full of way more nutrients. One recent study even found that drinking whole milk could help prevent weight gain.

And now there’s another reason you might want to quit pouring the low-fat stuff into your morning brew: A new study published in the Journal of the Academy of Dermatology found an association between sipping skim milk and developing acne.

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The researchers analysed the eating habits of 225 teenagers between the ages of 14 and 19 and had dermatologists classify their skin status on a scale from moderate acne to blemish-free.

They found that teens with acne consumed significantly higher amounts of skim milk than participants with clear skin. The pimple-free group was more likely to drink either full-fat dairy milk, or other alternatives like soy or almond.

It’s important to note that the correlation between low-fat moo-juice and increased acne doesn’t technically mean that drinking skim milk causes zits—there could be other factors at play. Still, the researchers didn’t find any links between acne and other dietary factors, like sugar or saturated fats.

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Exactly why skim milk is associated with all the acne issues isn’t clear, either. The researchers suggest that it may have something to do with the fact that it’s missing the good-for-your-complexion fatty acids found in whole milk.

Regardless, if you’re dealing with pimples, it might be worth swapping your dairy choice to see if you notice any changes.

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