Saturated fats could help prevent heart disease
23 October 2013 Last updated at 10:50 BST
A cardiologist is disputing the idea that all saturated fats are unhealthy.
Dr Aseem Malhotra, a cardiology registrar at Croydon University Hospital, has written in the British Medical Journal that saturated fat from non-processed food might even help prevent heart problems.
John Maguire reports.