The Food and Drug Administration has upgraded a December recall of Classic Lays Potato Chips to Class 1, the highest priority designated by the agency.

Federal regulators have upgraded a product recall of Lay's Classic Potato Chips to the highest risk level for a batch that may contain undeclared milk ingredients. Last month, Frito-Lay issued a recall warning that more than 6,

The FDA has upgraded a recall of Lay’s Potato Chips to the highest level possible, meaning consuming the chips will cause adverse health consequences. In December, Texas-based food manufacturer Frito Lay recalled a limited number of Lay’s Classic 13oz because the product could contain undeclared milk ingredients.