Food manufacturers in the United States have 3 years to rid their products of partially hydrogenated oils, which the FDA has determined are not “generally recognized as safe” (http://1.usa.gov/1bsRrRy).
Partially hydrogenated oils are the primary dietary source of artificial trans fats often found in processed foods, including baked goods, stick margarine, and snack foods (http://1.usa.gov/1JbQfaH). Trans fats increase blood levels of low-density lipoprotein cholesterol, which in turn may increase the risk of cardiovascular disease.
Voelker R. Partially Hydrogenated Oils Are Out. JAMA. 2015;314(5):443. doi:10.1001/jama.2015.8387