…according to an article at MedPageToday. Trans fats are thought to cause or aggravate heart and vascular disease.
As long as a food serving has under 0.5 g of trans fat per serving, the manufacturers in the U.S. can claim “zero” trans fat. If you see “partially hydrogenated vegetable oil” in the ingredients list, the product has trans fat. From the article:
To assess changes in levels of trans fats in food products, Mozaffarian and colleagues looked at 270 products from prominent brands — including General Mills, Kellogg Company, Heinz, ConAgra, Safeway, Giant, Campbell Soup, Sara Lee, and Walmart — that were selected from certain large supermarkets and sold between 2007 and 2011.
They found that by 2011, 66% of those products had reduced levels of trans fats, with a mean decline of 1.5 grams per serving and a mean 78% drop in trans fat content in that group.
Most of these reformulated products (82%) reduced trans fat content to less than 0.5 grams per serving, but half of them still contained partially hydrogenated vegetable oils in the ingredients list, the researchers found.