Originally Posted by
LapLap
I'd be interested to know what the sugar content of unsweetened condensed milk is.
One can expect 100g of standard milk to have 5g of sugar (5%). My guess is that 100g of condensed milk would have something close to 15g of sugar. If unsweetened condensed milk makes up 200g, that's potentially an extra 20g of sugar (plus the 10g one expects milk to have naturally) that gets sneaked in undeclared into a Haagen Dasz 500g tub.
Concentrated apple juice is one of the ways companies add sugar "secretly" to children's foods and other products, milk is naturally sweet (or should be) and concentrating it makes it sweeter.
Sweetened condensed milk is more along the lines of how most of Ben & Jerry's flavours taste to me

You're over-complicating it. In the US (and the UK, I assume), nutrition labels show how many grams of sugar are in a product. Simply compare the sugar content of the ice cream you like to the sugar content of one you find to be too sweet.