(CNN) Most of the time, when you order fast food, you know exactly what you're getting: an inexpensive meal that tastes great but is probably loaded with fat, cholesterol and sodium.
But it turns out that the packaging your food comes in could also have a negative impact on your health, according to a report published Wednesday in the journal Environmental Science & Technology Letters.
The report found fluorinated chemicals in one-third of the fast food packaging researchers tested.
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These chemicals are favored for their grease-repellent properties.