I don't know but I've always thought that eventually we would be told it's better (or rather not so bad) to eat the real natural stuff like butter and sugar. The 'healthier' substitutes are in fact a concoction of chemicals that we haven't really seen the long term effects of. EG the artificial sweeteners that have now been banned. The only downside is their fat and calorie content. Moderation is the answer.
I've been eating proper butter again for several months and it's done me no harm, in fact i've managed to lose weight whereas when I was eating Lurpak Spreadable my excess weight wouldn't budge.
Real butter is natural so go for it. These plastic margarines are just that, plastic!!! Some fat spreads are OK but you need to see what's on the list.
Well cyclamates (as used in SweetnLow) have been banned in the States for years (though not in UK). There's also some argument about the effects of aspartame.