'Traffic Light' Labels (image) Massachusetts General Hospital Share Print E-Mail Caption In the Mass. General Hospital cafeteria, color-coded labels indicate the healthiest sandwich choices (green), along with those designated less (yellow) and least (red) healthy. Credit Mass. General Hospital Nutrition and Food Service Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.