Cutting salt, fat, sugar and calories without sacrificing flavor may be a task for a chef, and companies including PepsiCo and Kellogg have culinary professionals working in their test kitchens. In a recent event at the Culinary Institute of America's test kitchen in St. Helena, Calif., eight chefs created healthier dishes by replacing traditional ingredients like cream and butter with low-fat alternatives such as chestnuts and parsnips.

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