A reader recently asked how can a food list 0 grams of trans fat on the Nutrition Facts panel and still have partially hydrogenated vegetable oil listed in the ingredients. Are they not the same?
The answer is yes: trans fat is the same as partially hydrogenated vegetable oil. Trans fats are made by adding hydrogen atoms to vegetable oil through a process called hydrogenation. The “trans” refers to the positioning of these hydrogen atoms on different sides of the carbon atom...

