Which food has less impact on blood sugar?

ICING SUGAR, SUGAR, CARAMEL SWIRL (WATER, SUGAR, CORN SYRUP, SWEETENED CONDENSED MILK [CONCENTRATED MILK, SUGAR, LACTOSE], MODIFIED CORNSTARCH, MODIFIED PALM KERNEL OIL, BUTTER (CREAM, SALT), COLORS [CARAMEL, FD&C YELLOW #5, FD&C YELLOW #6, TITANIUM DIOXIDE]), SALT, SODIUM ACID SULPHATE, POTASSIUM SORBATE [PRESERVATIVE], GELLAN GUM), WATER, ENRICHED BLEACHED WHEAT FLOUR (WHEAT FLOUR, NIACIN, REDUCED IRON, THIAMINE MONONITRATE, RIBOFLAVIN, FOLIC ACID), SHORTENING (CANOLA, PALM, MODIFIED PALM AND PALM KERNEL OIL, MONOGLYCERIDES, POLYSORBATE 60), EGG, SOYBEAN AND/OR CANOLA OIL, CARAMEL FILLING (CORN SYRUP, HIGH FRUCTOSE CORN SYRUP, SUGAR, WATER, SWEETENED CONDENSED MILK [CONCENTRATED MILK, SUGAR, LACTOSE], CANOLA OIL, MODIFIED PALM OIL, MODIFIED PALM KERNEL OIL, WHEY [MILK], MODIFIED TAPIOCA STARCH, SALT, PECTIN, CARRAGEENAN, XANTHAN GUM, POTASSIUM SORBATE [PRESERVATIVE], NATURAL AND ARTIFICIAL FLAVOR, TETRASODIUM PYROPHOSPHATE, CITRIC ACID), CORN SYRUP, BUTTER (CREAM, SALT), MODIFIED CORNSTARCH, SKIM MILK POWDER, INVERT SUGAR, COCOA POWDER (PROCESSED WITH ALKALI), WHEY (MILK), LEAVENING BLEND (SODIUM ACID PYROPHOSPHATE, SODIUM BICARBONATE, CORNSTARCH, MONOCALCIUM PHOSPHATE, CALCIUM SULFATE), SOYBEAN LECITHIN, WHEAT GLUTEN, SALT, NATURAL AND ARTIFICIAL FLAVOR, SEA SALT, MONO- AND DIGLYCERIDES, BLACKSTRAP MOLASSES, CARAMEL COLOR, DATEM.