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Trans Fatty Acids, or sometimes called Trans-fat, are manufactured fats created from a hydrogenation process, aimed at stabilizing polyunsaturated oils to prevent it from becoming rancid and to keep solid at room temperature. Hydrogenated fats are used in stick margarine, fast foods, commercial baked goods (donuts, cookies, crackers), processed foods, and fried foods.
Trans-fat was pushed to get consumers off of saturated fats. Some researchers have argued that trans-fat are particularly harmful to health, raising bad (low-density lipoproteins) cholesterol while lowering good (high-density lipoproteins) cholesterol.
During 2006 and earlier, fast food chains began to experiment with other non-hydrogenated oils so as to minimize trans-fats of their fried foods to nothing.
New York City was the first city to ban trans-fat in 2007. Other North American cities began to consider their ban.
Fast-food chains had been experimenting with alternate, non transfat oil sources. Wendy's became the first major burger chain to announce that it would no longer use transfat.