Which food has less impact on blood sugar?

SOURDOUGH BREAD (WHEAT FLOUR, WATER, WHEAT GLUTEN, SALT, CULTURED UNBLEACHED WHEAT FLOUR, CALCIUM SULFATE, SEA SALT, ENZYMES, ASCORBIC ACID, YEAST), LETTUCE, WHEAT BREAD [ENRICHED WHEAT FLOUR (NIACIN, FERROUS SULFATE, THIAMIN MONONITRATE, RIBOFLAVIN, FOLIC ACID, MALTED BARLEY, ASCORBIC ACID), WATER, WHOLE WHEAT FLOUR, CRACKED WHEAT, WHEAT BRAN, SUGAR, YEAST, BROWN SUGAR, CONTAINS 2% OR LESS OF: SOYBEAN OIL, VITAL WHEAT GLUTEN, SALT, VINEGAR, MONOGLYCERIDE, ENZYMES, ASCORBIC ACID], HAM (PORK, CURED WITH: WATER, SALT, CONTAINS 2% OR LESS OF: DEXTROSE, POTASSIUM LACTATE, SODIUM LACTATE, SODIUM PHOSPHATE, SODIUM DIACETATE, SODIUM ERYTHORBATE, SODIUM NITRITE), TURKEY (TURKEY BREAST, TURKEY BROTH, CONTAINS 2% OR LESS OF: SALT, MODIFIED CORN STARCH, SUGAR, CARRAGEENAN, SODIUM PHOSPHATE, FLAVORINGS), MAYONNAISE (WATER, SOYBEAN OIL, EGG YOLK, CORN STARCH, DISTILLED VINEGAR, CONTAINS 2% OR LESS OF: SALT, EGG WHITE, XANTHAN GUM, SPICE, LEMON JUICE CONCENTRATE, DL-ALPHA-TOCOPHERYL ACETATE, NATURAL FLAVOR), TOMATO, SWISS CHEESE (PASTEURIZED CULTURED SKIM MILK, CHEESE CULTURE, SALT, ENZYMES), BACON (PORK, CURED WITH: WATER, SALT, SMOKE FLAVORING, SUGAR, SODIUM DIACETATE, DEXTROSE, SODIUM ERYTHORBATE, SODIUM NITRITE).