Even if the control group in the Minnesota Coronary Survey received margarine and shortenings as saturated fat sources and potentially more trans fats, they still performed better than the higher polyunsaturated fat group.

“this study has potentially been criticized because the control group received both margarine and shortenings as a source of saturated fat but regardless the control group still did better even if they got significantly more trans fats the control group still did better in this study”