Ingredients:

French Fries: Potatoes, partially hydrogenated soybean oil, natural flavor (beef source), dextrose, sodium acid pyrophosphate (to preserve natural color). Cooked in partially hydrogenated vegetable oils (may contain partially hydrogenated soybean oil and/or partially hydrogenated corn oil and/or partially hydrogenated canola oil and/or cottonseed oil and/or sunflower oil and/or corn oil). TBHQ and citric acid added to help preserve freshness. Dimethylpolysiloxane added as an anti-foaming agent.



Sources: http://www.mcdonalds.com/countries/usa/food/nutrition/categories/ingredients/index.html#2