@northoftheborder the ons to really watch are flavoured 0% yoghurts. To make up for the mouthfeel lost with the fat, manufacturers often add:

Sugar or sweeteners (sucralose, aspartame, stevia) some of which may be carcinogenic
Thickeners and stabilisers — modified starch, pectin, gelatin, guar gum, carrageenan
Fruit purée or "fruit preparation" (often more sugar than fruit)
Milk protein concentrate or skimmed milk powder for body
Flavourings and sometimes colourings (often the ones in the US have been banned for decades in Europe).