A two-year study involving more than 5 000 people, has found that giving cafeteria food 'traffic light labels - green being healthy and red being least healthy, saw people gradually start making healthier "green label" food choices.
from Health24 News https://www.health24.com/Diet-and-nutrition/News/watch-traffic-light-food-labels-lead-to-healthier-food-choices-20190828-2
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