Hi Jon, and welcome to the forum.
errrm, low sugar, what a great piece of advice to have received. Firstly, I think what they mean by that is when sugar is included as an ingredient - the higher up the ingredients list the more there is - my thoughts, cut out the obvious sugars - sweets, non-diet fizzy drinks and so on.
There is an excellent thread in the Food Forum called
Carbs 101 & 102 which goes into carbohydrates in more detail. As I understand it, the sugar component of the carbohydrates section of the nutrition info label quantifies how many mono and disaccharides are included in the carbohydrate content.
You obviously need better dietary advice than that which has already been given you. Ask for, nay demand, a referral to the dietetics department. The British Dietetics Association have a good set of leaflets which can be found
here including a brief introduction to carbohydrates and their recommendations for a diet for people with diabetes. I would add, at this point, that there isn't a one-size-fits-all diet for diabetes and that we are unique - you need to devise a diet that works for you in helping meet your requirements - having said that, some of us do well on the Low GI diet recommended by the BDA, others find that further reducing carbohydrate intake has helped them.
Stick around, this is a friendly place, feel free to ask away and contribute.
Regards, Tubs.