The 22 Worst Foods for Trans Fat

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Credit: Corbis

French fries

Trans fat is made by adding hydrogen to vegetable oil.

Many restaurant chains have stopped frying food in hydrogenated oils, and recent research found that five in particular—McDonald's, Burger King, Wendy's, Jack in the Box, and Dairy Queen—had significantly reduced trans-fat levels in french fries.

But others have been slow to embrace the trend: A large Cajun fries from Popeyes Louisiana Kitchen, for example, still contains 3.5 grams of trans fat.

Next: Anything fried or battered