The food labeling discussion, like the weather, is heating up

Today's Daily Telegraph online writes about the rival systems of gda (guidance for daily allowance in %) and traffic-light labeling (giving red, amber or green traffic lights for levels of sugar, fat and salt content). The UK Food Standards Agency advocates the traffic-light scheme.

Which one better supports decision-making, helps change eating habits? What can't be helpful for consumers are conflicting systems.

One behavioural change worth noting ...
A representative of the Austrian Consumer Agency quoted a study where British teenagers buy red label only - it's uncool to eat healthy food. Unfortunately I haven't been able to find the study so far, but I'll keep you posted.