Cauliflower is a cruciferous vegetable that is naturally high in fiber and B-vitamins. It provides antioxidants and phytonutrients that can protect against cancer. It also contains fiber to enhance weight loss and digestion, choline that is essential for learning and memory, and many other important nutrients.cauliflower has also branched out in recent years: it's a coveted lower-carb alternative to pizza crust, rice and even some pastas.