It was called the Seven Countries Study. In the 1950s, Ancel Keys set out to link dietary fat to heart disease. But instead of using all the data available to him, he selected only seven countries that supported his theory, leaving out places like France and Germany, where people ate more fat but had lower rates of heart disease. That cherry-picked data shaped decades of public health policy and turned cholesterol into a scapegoat. As Nina Teicholz explains in The Big Fat Surprise, the study lac