The FDA's call for companies to disclose the amount of trans fats in their products has prompted food companies such as Kraft Foods, Kellogg Co. and Frito-Lay to start eliminating trans fats from their food products and substitute alternatives such as palm oil, palm kernel oil and canola oil. Another process, interesterification, redistributes fat acids in a way that makes liquid fats function more as solid fats. "The nutrition community is puzzled by what might be the most healthful alternative to trans fat," one expert says.

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