If a product that allergic persons have been tolerating for years now (with the new labeling laws) declares an allergen, do you simply stop giving it to them?
Only you and your doctor can determine whether you should eat a certain food. You should not assume, however, that you can continue to eat a food simply because you could eat it safely in the past. The food formulation may have been changed, the manufacturer may have received new information indicating that a major allergen may now be present in the food, or the manufacturer may be adding the name of the major allergen because FALCPA does not contain an exemption for major allergens that may be present in small quantities thought to be inconsequential. It is impossible to know which is the case. The safest course is to avoid any food that declares the major allergen.