Which food has less impact on blood sugar?

ROMAINE LETTUCE, CAESAR DRESSING (SOYBEAN OIL, WATER, PARMESAN CHEESE [PASTEURIZED MILK, CHEESE CULTURE, SALT, ENZYMES], CORN VINEGAR, EGGS, CORN SYRUP, SALT, SUGAR, CONTAINS LESS THAN 2% OF CURED ANCHOVIES, SPICES, CITRIC ACID, DEHYDRATED GARLIC, LEMON JUICE CONCENTRATE, NATURAL FLAVOR, XANTHAN GUM, DEHYDRATED ONION, DEFATTED SOY FLOUR, SODIUM BENZOATE [PRESERVATIVE], DISTILLED VINEGAR, CALCIUM DISODIUM EDTA [ADDED TO PROTECT FLAVOR], CARAMEL COLOR, EXTRACTIVES OF TURMERIC), WHITE MEAT CHICKEN (CHICKEN BREAST WITH RIB MEAT, WATER, CULTURED SUGAR AND VINEGAR, POTATO STARCH, SEA SALT, NATURAL FLAVORS), PARMESAN CHEESE (PASTEURIZED PART-SKIM MILK, SALT, CHEESE CULTURE, ENZYMES, [POTATO STARCH AND POWDERED CELLULOSE {TO PREVENT CAKING}, NATAMYCIN {MOLD INHIBITOR}]), MULTIGRAIN CROUTON (WHEAT FLOUR, SUNFLOWER OIL, CRACKED RYE, CRACKED WHEAT, YEAST, SEA SALT, 2% OR LESS OF SUGAR, WHEAT GLUTEN, DEHYDRATED ROASTED GARLIC, NATURAL OLIVE OIL FLAVOR, ASCORBIC ACID)