The 4.7% as OK is referred to by David in relation to yoghurts. I also assume the same would be true for any dairy product.
The only thing you need to watch for is "low-fat" products which have had the flavour removed along with the fat and replaced with sugar and salt.
And of course a lot of dairy products have fruit added to make them more attractive, and that is all fructose.
Basically you need to read the labels and avoid anything with more than 5% "sugars" for dairy products, and 2% for everything else.
JohnN