I was thinking about this story today, it's fascinating. In order to not run afoul of allergen labelling with a new sesame requirement, food manufacturers are *adding* sesame to foods that never had them before.
New label law has unintended effect: Sesame in more foods
A new federal law requiring that sesame be listed as an allergen on food labels is having unintended consequences — increasing the number of products with the ingredient. Food industry experts said the requirements are so stringent that many manufacturers, especially bakers, find it simpler and less expensive to add sesame to a product — and to label it — than to try to keep it away from other foods or equipment with sesame.
apnews.com