Frozen fruits, vegetables and even fish can be just as nutritious as fresh, especially when fresh options are out of season. Skip the added sauce, sugar or fat. Although high in sugar, some frozen yogurts have probiotic benefits. Look for a "live and active cultures" seal on the package. For convenient frozen meals, select those with high fiber (3 to 5 grams), zero trans fat and less than 600 mg of sodium and 5 grams of saturated fat.