Trans fats can be found naturally in low levels in some foods, however they are also added to foods to extend their shelf life. Governments in some countries have developed policies to remove these fats because of links with poor health outcomes, however this remains a voluntary process in the UK. This article describes how healthcare professionals can help patients to monitor levels of trans fats in their diet and increase awareness about the potential effects of these fats on health. The latest evidence from research in this area is also presented.