If the preliminary determination is finalized, according to the FDA, then partially hydrogenated oils will become food additives that could not be used in food without approval. Foods with unapproved additives cannot legally be sold.
Trans fat can be found in processed foods including desserts, microwave popcorn products, frozen pizza, margarine and coffee creamer, and has been linked to an increased risk of heart disease.
Partially hydrogenated oil is formed when hydrogen is added to liquid oils to make solid fats, like shortening and margarine. It increases the shelf life and the flavor of foods. Partially hydrogenated vegetable oil, or shortening, was used in American kitchens as early as 1911.
However, in recent years many food manufacturers have taken steps to limit or eliminate trans fat from their products.
McDonald's, for instance, stopped cooking its french fries in trans fat more than a decade ago. The company's website says all its fried menu items are free of trans fat.
New York City in 2007 adopted a regulation banning partially hydrogenated vegetable oils and spreads in restaurants.
Trans fat intake among American consumers decreased from 4.6 grams per day in 2003 to about a gram a day in 2012, according to the FDA.
However, "current intake remains a significant public health concern," FDA Commissioner Margaret Hamburg said in a written statement.
There is no safe level of consumption of trans fat, Hamburg said. It has been shown to raise the "bad," or LDL, cholesterol.
Image: Margarine on bread, via Shutterstock