An unexpected finding was the large variation in the dK content of foods analyzed post-2006. Whereas for some foods, dK was present in all samples analyzed pre-2006, the range of dK in samples analyzed post-2006 indicated a wide range of practices in terms of use of hydrogenated plant oils. For example, butterflavored popcorn contained large amounts of dK in all samples analyzed pre-2006 but post-2006, dk content ranged from nondetectable to 80 mg/100 g of popcorn. This large range emphasizes the need for clear labeling for consumers to identify ingredients such as hydrogenated plant oils in their foods.