Fessing Up to Fats

Hidden in processed foods are dangerous trans-fatty acids. But thanks to new labeling rules, the jig is up

It's just one little line added to those inscrutable nutritional labels, but the tiny change has sent tremors through the food industry--and may soon be felt in your pantry. Even if you've never heard of or cared about trans-fatty acids, packaged foods will now have to come clean about just how much of them they're packing, thanks to a government ruling issued last week.

To nutritionists, who know all fats are not created equal, that's good news. Unsaturated fats (those that are liquid at room temperature and contain fewer hydrogen atoms) are comparatively benign, but saturated fats (solid at room temperature...

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