Which food has less impact on blood sugar?

FLATBREAD (ENRICHED UNBLEACHED WHEAT FLOUR (WHEAT FLOUR, MALTED BARLEY FLOUR, NIACIN, IRON, THIAMINE MONONITRATE, RIBOFLAVIN, FOLIC ACID), FILTERED WATER, CANOLA OIL, SEA SALT, CULTURED WHEAT, OAT FIBER, SUGAR, BAKING POWDER (SODIUM ACID PYROPHOSPHATE, POTATO STARCH, SODIUM BICARBONATE), YEAST), CREAM CHEESE (PASTEURIZED MILK AND CREAM, CHEESE CULTURE, SALT, GUAR GUM, CAROB BEAN GUM, XANTHAN GUM), HARD SALAMI (PORK, SALT, CONTAINS LESS THAN 2% OF: DEXTROSE, NATURAL FLAVORING, WINE, NATURAL SMOKE FLAVOR, GARLIC, LACTIC ACID STARTER CULTURE, SODIUM ASCORBATE, POTASSIUM NITRATE, SODIUM NITRITE), PEPPERONI (PORK, SALT, CONTAINS 2 OR LESS OF BEEF, DEXTROSE, FLAVORINGS, LACTIC ACID STARTER CULTURE, OLEORESIN OF PAPRIKA, SODIUM NITRITE, SPICES, VITAMIN (SODIUM ASCORBATE), BHA, BHT, CITRIC ACID), HAM (CURED WITH WATER, CONTAINS LESS THAN 2% OF: SALT, SUGAR, POTASSIUM LACTATE, SODIUM DIACETATE, SODIUM PHOSPHATE, SODIUM ERYTHORBATE, SODIUM NITRITE), PROVOLONE CHEESE (PASTEURIZED MILK, CHEESE CULTURE, SALT, ENZYMES), GREEN LEAF LETTUCE RED ONION, CONTAINS 2% OR LESS OF MILK, GARLIC, SALT, SPICES.