People are likely to choose healthier and more sustainable canteen meals if they are labelled with a traffic light system.

‘The study’s findings show that this method could be valuable to be used to persuade people in making choices to eat more sustainably.’

The idea being that, when people see the traffic lights associated with different meals, they will opt for the more environmentally friendly options and the healthy options. 




Previous studies have examined the impact of traffic light systems on consumer choices for individual food products, but this study considered their use in an everyday simulated lunch time set up much like the kinds of situation where people make actual meal choices.
This kind of behavioral intervention designed to improve decisions in our day-to-day lives is commonly known as a 'nudge'.
What is novel about this study is that it is able to compare the relative impact of traffic lights, as nudges, to support positive changes in behavior when the traffic lights indicate healthy eating, and when they indicate environmental friendliness.
The findings also show that when accompanied with more information about what the traffic lights refer to, such as the actual values of daily calorie intake and acceptable levels of carbon emissions, this then boosted the positive changes towards healthier and more environmentally friendly meals.
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"In addition, and more importantly, the findings show that the persuasive effects are boosted by general information about daily calorie intakes and acceptable levels of carbon emissions associated with meals. This means, that while traffic light nudges are intuitive to understand, people need additional information to interpret more precisely what the different colors of traffic lights actually refer to."
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Although presenting two traffic lights, one indicating 'greener' meals and the other indicating 'healthier' meals, at the same time might overload the consumer, the researchers found that presenting both compared to just one actually boosted the positive effect on consumer meal choices.
Dr Osman added: "Given the current social policy interests in persuading people to make choices that mean we eat more sustainably, which means eating less red meat, less of depleted fish stocks, and less dairy, and move towards eating more vegetables, then studies like the one we conducted help to show what methods could be used to inform people about sustainable meal options in a clear and intuitive manner."
Source-Eurekalert