Which food has less impact on blood sugar?

INGREDIENTS: VANILLA CAKE (SUGAR, ENRICHED WHEAT FLOUR BLEACHED [FLOUR, NIACIN, IRON, THIAMINE MONONITRATE, RIBOFLAVIN, FOLIC ACID), FOOD STARCH-MODIFIED, SOYBEAN OIL, CONTAINS 2% OR LESS OF: DEFATTED SOY FLOUR, EGGS, LEAVENING [BAKING SODA, SODIUM ALUMINUM PHOSPHATE), MONO- AND DIGLYCERIDES, NATURAL AND ARTIFICIAL FLAVOR, PROPYLENE GLYCOL MONOAND DIESTERS OF FATTY ACIDS, SALT, SODIUM STEAROYL LACTYLATE, VITAL WHEAT GLUTEN, WHEY.), FROSTING (WATER, SUGAR, HYDROGENATED PALM KERNEL OIL, DEXTROSE, SODIUM CASEINATE, CONTAINS LESS THAN 2% OF THE FOLLOWING: CITRIC ACID, POLYSORBATE 80, SALT, XANTHAN GUM, POLYSORBATE 60, CARBOHYDRATE GUM, POLYGLYCEROL ESTERS OF FATTY ACIDS, POTASSIUM SORBATE, MONO AND DIGLYCERIDES), WATER, STRAWBERRY FILLING (WATER, SUGAR, STRAWBERRY PUREE, CORN SYRUP, MODIFIED FOOD STARCH, CONTAINS 2% OR LESS OF CITRIC ACID, NATURAL AND ARTIFICIAL FLAVOR, SALT, POTASSIUM SORBATE [PRESERVATIVE], SODIUM BENZOATE (PRESERVATIVE], CELLULOSE GUM, SODIUM ALGINATE, RED #40), EGGS, SOYBEAN OIL, SUGAR, PUDDING (MODIFIED TAPIOCA STARCH, DEXTROSE, SALT AND 2% OR LESS OF EACH OF THE FOLLOWING: TITANIUM DIOXIDE [COLOR], CARRAGEENAN, GLUCONO DELTA LACTONE, PRESERVATIVES [POTASSIUM SORBATE, SODIUM BENZOATE], ARTIFICIAL FLAVOR, CORN STARCH, SILICON DIOXIDE [FLOW AID] YELLOW 5, YELLOW 6.), MARGARINE (PALM OIL, SOYBEAN OIL, CULTURED SKIM MILK, SKIM MILK, SALT, MONO-DIGLYCERIDES, SOY LECITHIN, VITAMIN A, PALMITATE, COLORED WITH BETA CAROTENE [SOURCE OF VITAMIN A], NATURAL AND ARTIFICIAL FLAVOR)