[Kizzy]

I don't think they do, I think that nutrition is really complex actually we're told so many conflicting things all the time. there are around 50 different terms for sugar in food labelling, and all carbs are not created equal.
There are good fats, and bad fats... Cutting through all the jargon and the pseudo science in advertising as well as conflicting media reports and focussing on what is actually healthy not what is promoted as healthy is getting quite difficult.