Broccoli is a member of the cabbage family, of which cauliflower, kale, and Brussels sprouts are also members. Also known as cruciferous vegetables, they contain fiber, vitamin C, vitamin K, iron, and potassium. Broccoli contains more protein than most other vegetables, great for those on a plant-based diet. Per cup, broccoli has just 30 calories, but 2.4 grams of fiber and 2.5 grams of protein. Just half a cup of broccoli contains almost 70% of the daily value of calcium. Broccoli also contains folate, important for pregnant women and fetal growth, and potassium, beneficial for blood pressure