Which food has less impact on blood sugar?

FILLING: KRONOBROIL GYRO MEAT (BEEF, WATER, BREAD CRUMBS [BLEACHED WHEAT FLOUR, DEXTROSE, SALT, YEAST], LAMB, SOY PROTEIN CONCENTRATE, CEREAL BINDER [CORN, WHEAT, RYE, OAT & RICE FLOURS], CONTAINS LESS THAN 2% OF SALT, SEASONING [SPICES, GARLIC POWDER, ONION POWDER, SOYBEAN OIL], YEAST EXTRACT, DISODIUM INOSINATE & GUANYLATE), SPINACH, FETA CHEESE (PASTEURIZED PART-SKIM MILK, CHEESE CULTURE, SALT, ENZYMES, POWDERED CELLULOSE [TO PREVENT CAKING], NATAMYCIN [A NATURAL MOLD INHIBITOR]), MILK, RED ONION, LEMON JUICE, MINT, DILL. DOUGH: FLOUR (ENRICHED WHEAT FLOUR [BLEACHED WHEAT FLOUR, NIACIN, REDUCED IRON, THIAMINE MONONITRATE, RIBOFLAVIN, FOLIC ACID], MALTED BARLEY FLOUR), WATER, MARGARINE (VEGETABLE OIL BLEND [SOYBEAN OIL, PALM OIL, PALM KERNEL OIL], WATER, SALT, SOY LECITHIN, VEGETABLE MONO & DIGLYCERIDES, POTASSIUM SORBATE [A PRESERVATIVE]), CITRIC ACID [A PRESERVATIVE], BETA CAROTENE [COLOR], ARTIFICIAL BUTTER FLAVOR, VITAMIN A PALMITATE), SHORTENING (INTERESTERIFIED, SOYBEAN OIL), SUGAR, SALT, BAKING POWDER (SODIUM BICARBONATE, CORNSTARCH, SODIUM ALUMINUM SULFATE, CALCIUM SULFATE, MONOCALCIUM PHOSPHATE), YEAST, BAKING SODA SODIUM BICARBONATE).