Hydrogenated vegetables oils are the primary source of artificial trans fats in food. And McDonald's themselves readily admits they used to use trans fats in their fryers.
> For example, we switched to a cooking oil in our restaurants that reduced artificial trans fat in most of our fried menu items
> The fast-food giant already has demonstrated that it can eliminate trans fats when required. In Denmark, the company switched the oil it uses to make French fries to one that doesn't have any trans fat.
