Katie Simpson bought frozen pizzas about five times in the past year, including a California Pizza Kitchen Personal Pizza Barbeque Chicken and the same maker’s Crispy Thin Crust Pizza Signature Pepperoni.

But when she learned they contained trans fat—an ingredient linked to heart disease, diabetes and cancer—she felt as if she were sold poison.

That’s the argument being made in a $5 million federal class-action lawsuit that claims Nestle—makers of DiGiorno, Stouffer’s and California Pizza Kitchen frozen pizzas —is “placing profits over public health” by failing to remove trans fat.