Actually, cabbage is not a negative net carb count. This is from the USDA Nutrient Database which we have as a carb counter in Low Carb Tools at the top of the page for 1/2 cup of green cabbage:

Calories 8.400
Protein 0.423 g
Fat 0.063 g
Carbohydrate 1.880 g
Fiber 0.805 g

Karen