There may be something in your food that you cannot see and cannot taste. But it could be killing you. It is an artificial oil commonly called trans fat. Trans fat is a toxic chemical that has been added to our food supply and accounts for an estimated more than 500,000 deaths every year. That is Dr. Tom Frieden. He is head of the public health organization Resolve to Save Lives. He was the director of the Centers for Disease Control and Prevention in the United States from 2009 to 2017. On Monday, the World Health Organization announced a plan to help countries remove trans fats from the world’s food supply within the next five years.