Partially-hydrogenated oils (PHOs) are those oils that have undergone the partial hydrogenated process. This process divides the molecules, similar to the hydrogenation process but intentionally stops mid-process. This creates an semi-solid oil (like margarine) rather than a solid; however, trans fats are also produced as a result of this incomplete chemical process. The FDA has recently removed all Partially-Hydrogenated Oils from their GRAS List of safe foods.
