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,

Frito-Lay has recalled over 6,000 bags of Lay’s Classic Potato Chips due to undeclared milk, which poses a serious risk to individuals with dairy allergies. The FDA upgraded the recall to Class I—the highest risk level—after determining the chips could cause life-threatening allergic reactions,

The oversight could result in “death,” at least for those with a milk allergy or sensitivity, says the FDA. FDA initiated the recall on Dec. 13 and announced three days later that it was recalling the chips due to a potential or undeclared allergen. At present, no allergic reactions have been reported.