Which food has less impact on blood sugar?

GYROS: BEEF, LAMB, WATER, BREADCRUMBS (BLEACHED WHEAT FLOUR, SUGAR, SALT, YEAST, AMMONIUM CARBONATE), CEREAL (CORN FLOUR, WHEAT FLOUR, OAT FLOUR, RICE FLOUR), SALT, CELLULOSE POWDER, DEHYDRATED ONION, DEHYDRATED GARLIC, SODIUM CITRATE, STARCH (POTATO), OREGANO, BLACK PEPPER, MONO AND DIGLYCERIDES, SODIUM PHOSPHATE, CITRIC ACID, SOYBEAN OIL, DISODIUM INOSINATE AND GUANYLATE, PITA: ENRICHED WHEAT FLOUR (WHEAT FLOUR, MALTED BARLEY FLOUR, NIACIN, REDUCED IRON, THIAMINE MONONITRATE [B1], RIBOFLAVIN [B2], FOLIC ACID), WATER, SOYBEAN OIL, CONTAINS 2% OR LESS OF: YEAST, SALT, SUGAR, DOUGH CONDITIONER (CALCIUM SULFATE, ACACIA GUM, VEGETABLE MONO AND DIGLYCERIDES, ENZYMES), BAKING POWDER (SODIUM ACID PYROPHOSPHATE, SODIUM BICARBONATE, MONOCALCIUM PHOSPHATE), YEAST NUTRIENTS (AMMONIUM SULFATE, ASCORBIC ACID, AZODICARBONAMIDE), CALCIUM PROPIONATE AND POTASSIUM SORBATE (PRESERVATIVES), TZATZIKI: SOUR DRESSING (SKIM MILK, COCONUT OIL, MODIFIED FOOD STARCH [CORN], SOYBEAN OIL, MONO AND DIGLYCERIDES, GELATIN, LACTIC AND CITRIC ACID, GUAR GUM, POTASSIUM SORBATE TO PRESERVE FRESHNESS, SUNFLOWER LECITHIN, XANTHAN GUM, NATURAL FLAVOR, CARRAGEENAN, DISODIUM PHOSPHATE), WATER, FRESH CUCUMBERS, FLAVORINGS (VINEGAR, LEMON JUICE, SUGAR, GRANULATED GARLIC, XANTHAN GUM)