Swiss chard has only 35 calories and 7 grams carbs per one cup serving. Unlike other greens, chard stalks are edible, but must be cooked longer than the leaves. Try sautéing chard with garlic and onions, then add a can of diced tomatoes to form sauce. Serve the sauce with whole wheat or low-carb pasta. Garnish with pine nuts, olives, and crushed red pepper for a satisfying, carb-conscious meal.