We've had regulation in the UK for a while now
And it doesnt really help.
Granted its a step in the right direction but education for the consumers is equally important.
We have enforced labelling of all additives, including salt on our packaging for over a year to my knowledge and probably longer. I'm not sure whether salt is mandatory but everything carries a little blue label or at least an RDA-based percentage in the nutritional information, which IS mandatory.
People still buy packaged and convenience goods knowing full well they contain too much sugar, and salt, but the policies on additives mean that consumers are buying them to avoid the REALLY nasty additives that most manufacturers still insist on using. Things like Aspartame, Acesulphame-K, Tartrazine and a whole slew of chemicals we are constantly warned to avoid.
What we really need is a decade-long campaign to educate people as to the best way to enjoy the process of fueling their bodies - it is after all a life process, and not an entertainment although to look at our culture you'd think otherwise.
Peace!