The only way to know for sure whether packaged foods are trans fat-free is to look for the label "trans fat-free."

Question

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Even if a product is labeled "trans fat-free," it's important to check the ingredients list for partially hydrogenated oils, which are a primary source of trans fats. In some jurisdictions, products can be labeled as "trans fat-free" if they contain less than a certain amount of trans fats per serving, meaning they might still contain small amounts of trans fats.

The Only Way to Know for Sure Whether Packaged Foods