there are LOADS of delicious things which are low in carbs.
examples
meats, fish, eggs, cheese, TVP products like Quorn
ALL leafy green veggies/salads, cauliflower, broccoli, Celeriac, swede/turnip. Most roots have some starch, but an be handled iff you watch your portions.
most fruits have a fair bit of sugar, so eat with care. Berries tend to be lower in carbs.
note
tomatoes and peppers are fruits. so are cucumbers, but they are low in carbs. Again watch the portions.
Essentially anything sweet is carby as is anything starchy like bread potatoes, any grain based food, baked goods.
Pulses are quite high in carbs.
Your nurse is right. you CAN eat anything, but need to watch how much.
Nuts are a useful snack
Natural fats tend not to be an issue for diabetics.
thus, if I make a dessert for guests, I include mini meringues[low carb by virtue of lightness 50% of not much is even less :lol: ], cream and a few berries.
The secret of good blood glucose control is "Learn to cook!"