Which food has less impact on blood sugar?

FLATBREAD (ENRICHED FLOUR [WHEAT FLOUR, MALTED BARLEY FLOUR, NIACIN, IRON, THIAMINE MONONITRATE, RIBOFLAVIN, FOLIC ACID], WATER, VITAL WHEAT GLUTEN, LIQUID BROWN SUGAR, OAT FIBER, SOY FLOUR, CONTAINS 2% OR LESS OF SOYBEAN OIL, PRUNE JUICE CONCENTRATE, SODIUM ACID PYROPHOSPHATE, BAKING SODA, YEAST, WHEAT PROTEIN ISOLATE, POTASSIUM SORBATE & SODIUM PROPIONATE [PRESERVATIVES], CELLULOSE GUM, FUMARIC ACID, SALT, GUAR GUM, CALCIUM SULFATE, CARRAGEENAN, XANTHAN GUM, MALTODEXTRIN, ANNATTO COLOR, ENZYMES), PASTEURIZED PROCESS AMERICAN CHEESE (CHEDDAR CHEESE [MILK, CHEESE CULTURE, SALT, ENZYMES, ANNATTO], WATER, CREAM, SODIUM PHOSPHATE, SODIUM CITRATE, SALT, SORBIC ACID [PRESERVATIVE], APO-CAROTENAL [COLOR]), EGG PATTY (WHOLE EGGS, EGG YOLKS, GLYCERINE, BUTTER FLAVOR [LIQUID AND HYDROGENATED SOYBEAN OIL, SALT, SOY LECITHIN, NATURAL AND ARTIFICIAL FLAVOR, BETA CAROTENE {COLOR}, TBHQ AND CITRIC ACID ADDED TO PROTECT FLAVOR], SALT BLEND [SALT, DRIED VINEGAR, SOY LECITHIN], MODIFIED FOOD STARCH, GUM BLEND [CARRAGEENAN, GUM ACACIA, CELLULOSE GUM, MALTODEXTRIN, KONJAC, XANTHAN GUM], CITRIC ACID), HAM (CURED WITH HONEY, SALT, SUGAR, WATER, DEXTROSE, LACTIC ACID STARTER CULTURE, SODIUM ASCORBATE, SODIUM NITRITE).