Traffic light concept works for healthy eating, study says

Massachusetts General Hospital's study included labeling healthy items green, less healthy items yellow and unhealthy items red.

Jan. 9—What if eating healthy was as easy as playing your favorite childhood game?

In March 2010, Massachusetts General Hospital's cafeteria got an overhaul. Healthy items were labeled with a "green light," less healthy items were labeled with a "yellow light," and unhealthy items were labeled with a "red light." Healthier items were also placed in prime locations throughout the cafeteria, while unhealthy items were pushed below eye level.

The "Green Light, Red Light, Eat Right" method is a favorite among experts fighting childhood obesity. But doctors at Massachusetts General wanted to know if the colors could really inspire healthier eating habits among adults long-term.