[Evgeny]

The Greek style yoghurt only has 3.6% sugar and yes, there probably is a lower limit on sugar in yougurt as lactose is a natural component of milk and classifies as sugar.

http://www.arla.se/produkter/arla-ko/mild-yoghurt-grekisk-10...

[wodenokoto]

Skimmed milk has 4,7 grams of sugar per 100 gram of milk, so that is the baseline.

That does sound like a lot, but I think it is unfair to start classifying milk together with soda.