Thanks was going to ask my DSN on Tuesday, just rather fed up of trying to find low carb foods for tea xI asked that today - my nurse said under no uncertain terms that I can eat as much of whatever as I want - as long as I know the amount of carbs I am eating, and the ratio of carbs to units of insulin and then bolus for it, I am fine. Its always best to eat within the daily guidelines though.
That said, if your ratio is wrong, then the more carbs you eat, the more you will suffer!