Green leafy vegetables, including mustard, collard, turnips as well as spinach and card will give you 4-5 grams of pure fiber and are very low in carbs.Other Green Leafy Vegetables - including kale, broccoli, cabbage, cauliflower and Brussels sprouts are also packed with 3-6 grams of fabulous fiber in only 1 cup and have been emphasized for their cancer-protective benefits.