LAMBERTVILLE, N.J. -- Preliminary results of the study of a new form of 'traffic light' calorie labeling found it actually increases the amount that people eat in fast food restaurants. Presenting at the annual retreat of the Penn/CMU Roybal Center on Behavioral Economics and Health, Carnegie Mellon graduate scholar Eric Van Epps reviewed the outcome of using green, yellow and red color codes to inform the public about the healthiest selections at McDonald's restaurants. But instead of decreasing their intake, subjects exposed to the color-code system consumed an average of about 100 additional calories at each sitting.