Actually, they are very good for you. Brussels sprouts are in the same family as kale and cauliflower and contain lots of vitamins (particularly Vitamin K) and antioxidants. They are high in fiber and promote gut health (Healthline). Often, Brussels sprouts are prepared in ways that may make them less healthy. A cheesy gratin can be high in calories and is a special treat. If you're looking for healthier everyday options, try a Brussels sprouts salad, air fryer Brussels sprouts, or sautéed Brussels sprouts.