But the carb content is lowered by weight because the veg absorbs water. However, if you take a raw broccoli stalk worth maybe 4 carbs, and you boil the heck out of it, the broccoli stalk may end up weighing twice as much, effectively halving the carb count by weight, but if you eat the whole thing you're still going to get your 4 carbs. It doesn't change the actual number of carbs in the vegetable, it just pumps the veg full of water.