fatty acids— Trans fatty acids, or trans fats, are unsaturated fatty acids that contain at least one non-conjugated double bond in the trans configuration. Sources of trans fatty acids include hydrogenated/partially hydrogenated vegetable oils that are used to make shortening and commercially prepared baked goods, snack foods, fried foods, and margarine. Trans fatty acids also are present in foods that come from ruminant animals (e.g., cattle and sheep). Such foods include dairy products, beef, and lamb.