Which food has less impact on blood sugar?

ICEBERG LETTUCE, RANCH DRESSING (CANOLA OIL, CULTURED LOWFAT BUTTERMILK, WATER, SOUR CREAM [CULTURED NONFAT MILK, CREAM], EGG YOLKS, DISTILLED VINEGAR, SUGAR, CONTAINS LESS THAN 2% OF SALT, SPICES, DEHYDRATED GARLIC, LACTIC ACID, CORN STARCH, DEHYDRATED ONION, XANTHAN GUM, GUAR GUM, NATURAL FLAVOR), UNCURED HAM -NO NITRITES OR NITRATES ADDED EXCEPT THOSE NATURALLY OCCURRING IN SEA SALT AND CULTURED CELERY JUICE (PORK, WATER, CONTAINS 2% OR LESS OF: SEA SALT, SUGAR, CULTURED CELERY JUICE, VINEGAR, CHERRY POWDER), TURKEY BREAST (TURKEY BREAST, WATER CONTAINS 2% OR LESS OF: SALT, SUGAR, VINEGAR, CULTURED CELERY JUICE, CHERRY POWDER), GREEN LEAF LETTUCE, SWISS CHEESE (SWISS CHEESE [PASTEURIZED MILK, CHEESE CULTURE, SALT, ENZYMES], POTATO STARCH AND POWDERED CELLULOSE [TO PREVENT CAKING], NATAMYCIN [A NATURAL MOLD INHIBITOR]), CROUTONS (WHEAT FLOUR, SUNFLOWER OIL, SUGAR, SALT, YEAST, WHEY, MALTODEXTRIN, GARLIC POWDER, LACTIC ACID POWDER [LACTIC ACID, CALCIUM LACTATE], DEHYDRATED PARSLEY, CORN STARCH).