HEALTHY HABIT Satisfying soups donâ€™t have to be high in calories or salt. Canned broth is usually low in fat, and the reduced-sodium variety still has plenty of flavor. TO FREEZE: Cool soup to room temperature. Pour into airtight containers, leaving 1 inch of space at top. Freeze up to 3 months. TO REHEAT: Thaw in microwave or overnight in refrigerator; then warm over low heat, and serve with Cheese Toasts.