Cauliflower fully deserves to be regarded as a "green," even though it isn't green. It has the same range of nutrients as other brassicas. And it's high in fibre. Just don't overcook it, that's all. I love it and almost always have one in the house through the winter (not the same one all winter, I hasten to add). We're rather fond of tenderstem too. Cooking it just right can be a bit of a challenge. Ordinary calabrese I find to be bland and uninteresting. It can be OK in soups.