If

A new government regulation will require US foodmakers to list the amount of “trans fat” on the labels of most food products purchased in stores. Trans fat, which has been linked to heart disease, high cholesterol, and obesity, is something most people should limit or avoid altogether. The food and drug Administration estimates that Americans could save up to $1.8 billion in medical costs if they reduce their consumption of trans fats.

The key word is if—a reminder that the new labeling information will benefit only those who change their eating habits. It’s not what we know but what we do that counts.

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