Which food has less impact on blood sugar?

CAKE: BLEACHED ENRICHED WHEAT FLOUR (WHEAT FLOUR, NIACIN, REDUCED IRON, THIAMINE MONONITRATE, RIBOFLAVIN, FOLIC ACID), SUGAR, VEGETABLE SHORTENING (SOYBEAN OIL, VEGETABLE MONO AND DIGLYCERIDES, DISTILLED PROPYLENE GLYCOL ESTER TOCOPHEROLS [VITAMIN E] AND VITAMIN C PALMITATE [AS ANTIOXIDANT]), NONFAT DRY MILK, LEAVENING (SODIUM BICARBONATE, SODIUM ALUMINUM PHOSPHATE, MONOCALCIUM PHOSPHATE), CONTAINS 2% OR LESS OF EACH OF THE FOLLOWING: DEXTROSE, FOOD STARCH-MODIFIED, SALT, NATURAL AND ARTIFICIAL FLAVORS (MILK), CELLULOSE GUM, SOY LECITHIN, TETRASODIUM PYROPHOSPHATE, DISODIUM PHOSPHATE, DRIED EGG WHITES, EGGS, WATER, VEGETABLE OIL (SOYBEAN), MARGARINE (PALM OIL, WATER, SOYBEAN OIL, SALT, WHEY [MILK], MONO AND DIGLYCERIDES, SOYBEAN LECITHIN [SOY], NATURAL BUTTER FLAVOR, COLORED WITH BETA CAROTENE, VITAMIN A PALMITATE ADDED), BUTTER FLAVOR (WATER, GLYCERINE, NATURAL AND ARTIFICIAL FLAVORS), XANTHAN GUM, PROPYLENE GLYCOL ALGINATE, GUAR GUM, MONO AND DIGLYCERIDES, CITRIC ACID, TITANIUM DIOXIDE (COLOR), YELLOW 5, PRESERVATIVES (SODIUM BENZOATE, PROPYL GALLATE, CITRIC ACID), VANILLA FLAVOR (WATER, ETHANOL, PROPYLENE GLYCOL, ARTIFICIAL FLAVORS). BUTTERCREAM ICING: SUGAR, VEGETABLE SHORTENING (PALM OIL, CANOLA OIL, MONO- AND DIGLYCERIDES, POLYSORBATE 60), CONTAINS 2% OR LESS OF EACH OF THE FOLLOWING: ARTIFICIAL COLOR, CORN STARCH, NATURAL AND ARTIFICIAL FLAVORS, SALT, WATER. SPRINKLES: SUGAR, RICE FLOUR, VEGETABLE OIL (PALM KERNEL AND/OR PALM OIL), CORN STARCH, CELLULOSE GUM, CARRAGEENAN, DEXTROSE, SOY LECITHIN, TITANIUM DIOXIDE (COLOR), YELLOW 5, MALTODEXTRIN, RED 3, YELLOW 6, ARTIFICIAL FLAVOR, BLUE 1.