Greens
We're talking collard, chicory, beet, kale, mustard, Swiss chard and turnip greens. They all belong to the same family as spinach, and that's one of the super-stars. No matter how hard you try, you can't load a cup of plain cooked greens with any more than 50 calories.
They're full of fiber, loaded with vitamins A and C, and free of fat. You can use them in salads, soups, casseroles or any dish where you would normally use spinach