If you’re managing food allergies, you’ve probably encountered precautionary allergen labeling. After you’ve carefully read the ingredients list and any “Contains” statement, you might also find suggestions that other ingredients – allergens – are hiding in the package:
“May contain traces of…”
“Manufactured in a facility that processes…”
“Made on shared equipment with…”
What do these warnings mean? Do the different wordings represent different amounts of possible allergen, or different likelihoods of allergen cross-contact? Is a...