India, Jan. 31 -- In December, the US Food and Drug Administration issued a recall warning for Lay's Classic Potato Chips over the possibility that the concerned batch may consist of undeclared milk ingredients. On Monday, this warning was upgraded to 'Class I,' the most severe risk level, indicating that consumption could cause death.

The warning is addressed to a batch of more than 6,300 of its 13-ounce bags possibly containing undeclared milk that could kick-start a life-threatening allergic reaction. FDA's 'Class I' level recall means there is "reasonable probability that the use of, or exposure to, a violative product will cause serious adverse health consequences or death," per USA Today.

The compromised batch of potato chips was ...