Fat or oil
Partially hydrogenated oil
Oil processed to stay solid and shelf-stable; the main source of industrial trans fat. Fully hydrogenated oils are different and contain little trans fat.
Higher concern · Strong evidence
The main source of industrial trans fat, which raises heart-disease risk; FDA no longer allows it to be added to food.
Avoid or limit in the stated context.
Reviewed Oct 2, 2026
Evidence and sources
Partially hydrogenated oils are the main source of industrial trans fat, which raises LDL cholesterol and the risk of heart disease. In 2015 FDA determined they are no longer generally recognized as safe, and manufacturers had to stop adding them to foods.
A label that lists it may be out of date. Nutrition Facts can show 0 g trans fat when a serving has less than 0.5 g.
Strong evidence · Presence only; amount unknown · General population
- Final Determination Regarding Partially Hydrogenated Oils (Removing Trans Fat), U.S. Food and Drug Administration