In my country drinks with added sugar are taxed extra. So, for example, all the no sugar Coke or Pepsi variants are one price, but "classic" Coke or Pepsi with sugar in it are more expensive in the same quantities. A small nudge. And I already noticed it impacts bars and restaurants. If you're only going to bother stocking one cola beverage, why carry the one with sugar, which costs extra, when a customer asks for "A Coke" it's no harder to train staff to say "Pepsi Max OK?" than "Pepsi OK?".

As to "Who should know best?" that's exactly what we're paying our politicians to be on top of.