Which food has less impact on blood sugar?

TUNA SALAD (ALBACORE TUNA (WHITE TUNA, WATER, VEGETABLE BROTH, SALT AND SODIUM PYROPHOSPHATE); DRESSING (MAYONNAISE (PURE SOYA, CANOLA OIL, EGG YOLKS, VINEGAR, WATER, SALT, SUGAR, NATURAL FLAVORS, CALCIUM DISODIUM EDTA [TO PROTECT QUALITY]); LEMON JUICE (LEMON JUICE FROM CONCENTRATE [WATER, CONCENTRATED LEMON JUICE], LESS THAN 2% OF: SODIUM BENZOATE, SODIUM METABISULFITE & SODIUM SULFITE [PRESERVATIVES], LEMON OIL); BLACK PEPPER; SALT (SALT, YELLOW PRUSSIATE OF SODA)); CELERY), POTATO ROLL (UNBLEACHED ENRICHED WHEAT FLOUR (FLOUR, FERROUS SULFATE, NIACIN, THIAMIN, RIBOFLAVIN, FOLIC ACID), NONFAT MILK, RECONSTITUTED POTATOES (FROM POTATO FLOUR), YEAST, SUGAR, WHEAT GLUTEN, SUNFLOWER OIL, CONTAINS 2 PERCENT OR LESS OF EACH OF THE FOLLOWING: SALT, BUTTER, DOUGH CONDITIONERS (SODIUM STEAROYL LACTYLATE, MONOGLYCERIDES AND DIGLYCERIDES), MONOCALCIUM PHOSPHATE, CALCIUM PROPIONATE (A PRESERVATIVE), GUAR GUM, ASCORBIC ACID, DATEM, CALCIUM SULFATE, ENZYMES, TURMERIC COLOR, ANNATTO COLOR, SESAME SEEDS)