Which food has less impact on blood sugar?

WHEAT BREAD (UNBLEACHED ENRICHED FLOUR [WHEAT FLOUR, MALTED BARLEY FLOUR, NIACIN, REDUCED IRON, THIAMINE MONONITRATE. RIBOFLAVIN, FOLIC ACID], WATER, COARSE CRACKED WHEAT, WHOLE WHEAT FLOUR, HONEY, YEAST, FULLY REFINED SOYBEAN OIL, GRANULATED SUGAR. WHEAT GLUTEN. SALT, CALCIUM PROPIONATE [TO RETAIN FRESHNESS], DOUGH IMPROVER [MALTED WHEAT FLOUR, ENZYMES AND 2% OR LESS OF ASCORBIC ACID], ENRICHED WHEAT FLOUR (WHEAT FLOUR, NIACIN, REDUCED IRON, THIAMINE MONONITRATE, RIBOFLAVIN, FOLIC ACID], CONTAINS LESS THAN 2% OF ENZYMES, ASCORBIC ACID), TUNA SALAD (YELLOWFIN TUNA [YELLOWFIN TUNA, WATER, SALT], DRESSING BASE [WATER, SOYBEAN OIL, HIGH FRUCTOSE CORN SYRUP, VINEGAR, MODIFIED CORNSTARCH, EGGS, SALT, NATURAL FLAVOR, MUSTARD FLOUR, POTASSIUM SORBATE AS A PRESERVATIVE. PAPRIKA, SPICE, DRIED GARLIC], CELERY, DIJON MUSTARD [DISTILLED WHITE VINEGAR, MUSTARD SEED, WATER, SALT, WHITE WINE, CITRIC ACID, TARTARIC ACID, FRUIT PECTIN, SUGAR, SPICES], PRESERVATIVE [VINEGAR AND NATURAL FLAVOR], RED ONION, XANTHAN GUM, LEMON JUICE. SALT. BLACK PEPPER)