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Many seemingly heart-healthy foods, made with vegetable oils containing little saturated fat and no cholesterol, harbor the most heart-unfriendly fat of all: trans fat, which currently isn't labeled.
While meat and dairy products naturally contain small amounts of trans fat, the vast majority of trans in the American diet is created artificially by bubbling hydrogen gas through vegetable oil, a process called partial hydrogenation. That transforms some of the oil's unsaturated fat into trans fat, which helps stabilize the oil (making it useful for deep-frying and for packaged foods) and solidify it (making it suitable for margarine and many baked goods). But in ...