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.

Class I, according to the FDA, means exposure to or consumption of the product could cause "serious adverse health consequences or death."

The FDA issued a product recall on Lay's Classic Potato Chips in two states. The recall was upgraded to the highest risk factor over undeclared milk.

The FDA classified the recall of Lay's Classic Potato Chips in Oregon and Washington state as a Class 1 recall, which means consumption could be fatal for people with a milk allergy.

The FDA has issued a Class I recall for Lay’s Classic Potato Chips due to undeclared milk, warning of severe allergic reactions or death.

A previous FDA recall on certain Lay's potato chip products has now been updated to the category with the highest risk for consumers. What to know

The U.S. Food & Drug Administration has recalled a popular brand of potato chips saying the product may be high risk for some consumers.

Lay’s voluntary recall from December has been increased to the U.S. Food and Drug Administration’s highest risk level classification. On Dec. 13, Frito-Lay recalled more than 6,000 bags of 13 oz. Lay’s Classic Potato Chips due to “undeclared milk.” The affected chips were sold in Oregon and Washington.