On November 7, 2013, the Food and Drug Administration (FDA) announced that it has tentatively determined that partially hydrogenated oils (PHOs) are no longer generally recognized as safe (GRAS) for any use in food. PHOs are the primary dietary source of trans fat, and trans fat appears in some processed foods, including products such as desserts, microwave popcorn, frozen pizzas, margarines, and coffee creamers. This determination does not impact foods, like certain meat and dairy products from ruminant animals, which contain naturally occurring trans fat. Under the new proposed rule PHOs would be classified as a food additive, which requires FDA approval before being sold or used in a final food product. Therefore, if the FDA’s preliminary determination is finalized, food manufacturers would no longer be permitted to sell PHOs — either directly or as an ingredient in another food product—without prior FDA approval.