A hospital nutrition labeling program that used traffic-light colors of red, green and yellow resulted in a 9.2% decrease in sales of cafeteria foods and beverages with red labels and a 4.5% increase in sales of items tagged green, researchers reported in the American Journal of Public Health. The Massachusetts General Hospital team said rearranging foods to put those with green labels at eye level also led to a drop in sales of items with red labels.

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