Since you're never limited on vegetables with South Beach, I didn't have that problem...but I can see why you might for just the first little bit on Atkins.
See, that's where I differ with Dr. Atkins. He says keep your carbs at less than 20 net, right? Then he says eat a cup of salad veggies loosely packed.
I didn't do that. I did ours by the scale...I weight all our veggies on a postage scale and then enter in into the USDA database by grams of weight...
8 oz of spinach x 28.35 = 226.8g
The database has it in blocks of 100g, so 226.8 divided by 100 = 2.3 rounded. The net carbs for this much raw spinach is only 3.25g.
This is a HUGE amount of raw spinach! Fills a large bowl! Cooked lightly in olive oil, it makes a fair sized dish!