This is a good question. Actually, it is true that it is difficult because, once again, we are classifying food by dividing what is good for our health from what is not. To some extent, that is actually the danger in wanting to put too many labels on things, to put foods that seem to be healthy on a pedestal, while completely banishing or banning other foods. So that is something we have to pay specific attention to.
Up to now, the studies that we are beginning to conduct on the traffic light method are suggesting that the practice helps to inform people about the benefits of food for their health and to determine if one item is nutritionally better than another. But the practice still does not seem to influence people's ultimate choices or to have any direct impact on the buying behaviour of consumers.
People will not necessarily automatically choose food that they perceive as being better for their health. We also have to take into account issues such as price, taste and purchasing habits. The decision to buy is a complex one and the same applies to consumption because many other factors also come into play.