Just moderately reducing consumption of 'trans fats' may cut coronary heart disease by a quarter, but many food retailers are failing to help address the problem, according to a report by Health Which?. Hydrogenated fats are formed by bubbling hydrogen through vegetable oil and are used to extend the shelf life of the oil. The process creates trans fats, which many experts, including the UK's Food Standards Agency (FSA), now link to coronary heart disease and believe could be even worse than saturated fats.