Food products that indicate zero grams of trans fat per serving may still contain some trans fatty acids if the product contains partially hydrogenated oil. If a food has less than a half a gram of trans fat per serving, labeling regulations require that the product indicate zero grams on the label. Generally this is not a concern because a typical adult would need to consume more than five servings a day of these types of food to exceed the American Heart Association’s recommendation to consume less than one percent of dietary calories in the form of trans fats.